I think for a 49m2 room they are way small to fill it out with bass etc. comes down to what you want to prioritise though. The KH120s are wonderfully precise, fast and accurate, very good separation, great stereo soundstage…it’s an amazing speaker in its price class. You’d get these for your second listed goal, to work on tracks from start to finish.
you could second them with a cheap bigger set or a PA set for when you want it loud and fun only. Or you could get the monitors and then later add a woofer.
Personally with monitors I’d opt for precision/accuracy and definition over eg a pleasant sound 10 out of 10 times. You can only mix what you can hear. And the more you can hear, the more you can decide what people should be hearing. So I’d get the best quality speaker I could afford in my price bracket (size to me would be secondary but I also don’t listen all that loudly when I record & mix).
Of course I also understand the wish to feel the music and have fun with it in a big space such as yours. that’s why I suggested the Klein + Hummel O300s used…you should be able to find a pair for around 1200-1800€ - they were the predecessors to the KH310, so quite a bit bigger and more powerful than the KH120.
Just remember, the bigger your driver, the harder it becomes to manage the sound in space…ie acoustic treatment needs to be stepped up etc. i have Dynaudio Air 15s as secondary speakers in my home studio, which is around a 26m2 room…meaning, the speakers are technically way big for the room, but I listen to them quietly or I listen to them for fun (not analytically). If I turn them up, despite heavy acoustic treatment, the room is quickly drenched in bass frequencies and it gets loud and muddy. It’s the room not the speakers 
EDIT: thought I’d specify here: in fact in my listening position, when I use the Dynaudios and I turn them up, I hear hardly any bass, because the way they speakers interact with the room, the bass frequencies just happen to mostly cancel themselves out just around my listening position (my main speakers are the Munro Egg 150s and they’re set up just right for my position). However, if i take two steps away from my listening position into the room from, the bass will be so dominant that nothing else comes through. Classic example of a problematic match betwen speaker and room (ie too big)
So you’d have to consider acoustic treatment even more seriously if you want to go bigger (you should do that anyway!) and also your listening position. Judging from the photos, the table by the stairs facing the way it is facing would not be optimal for a bigger set (or in general). I’d do what @reeloy suggested and turn that table towards the bookshelf, centred to that wall and either close to the wall or 1/3 of the room away from the wall.
If you want to stay seated where you are, small speakers would make it easier to “control” them in the space.
If you know already that you will not want to treat the room much, go smaller. If you eventually want to treat the room and care for loudness, then either get a smaller analytical set and a bigger, cheaper fun set OR save up for the right size (read bigger) speakers and get one set that feels right to you.
Also, I’d always steer clear from woofers because in most home recording settings, they’d drown the room. I have the matching subwoofer to my Dynaudios, it’s been disconnected for years. But maybe that’s also just me and my relationship to bass
I’d consider putting some budget aside for a few bass traps (one in each corner) and a few broadband absorbers. Even a little can improve your listening situation a lot (and hence the performance of whatever speaker set you end up getting). Remember, you’re speakers will only ever be as good as the room will allow them to be.
You could look at Mike Senor’s book (I think it’s called Mixin Secrets for the Small Studio) for ideas on how to make the most of your room without spending a fortune or going into acribic, unnecessary detail (as in: beyond what your goals for the room and your production actual would require). it has a nice section on acoustic treatment, listening position, speaker placement etc.
Lastly I want to add that I too find Adam’s ribbon tweeters way too harsh and fatiguing…I guess different people have different sensitivities, but to me the higher frequencies are quite pronounced. Point being: whatever we recommend here, you’ll be best of trying out a few speakers you’re interested in and just see what suits you the best. You’ll have to learn the speakers, no matter which ones you end up getting
Hope some of this makes sense, it’s late here and I wrote more than I intended 
