Good East London advice, all very sound and valuable tips!
I’d add to this for (East) London:
Broadway market on a Saturday by London Fields, though super busy and ‘polished’ (for Hackney standards) it’s still enjoyable from a food and people point of view. Also the pub The Dove has an interesting selection of beers and you can get some of the Belgian beers someone else threw into the mix a few posts ago, in this pub.
Gillett Square in Dalston can be a cool hangout (NTS Live the radio station is there) and the Vortex Jazz Club there is one of the best in Lodnon.
Victoria Park is lovely with eg breakfast/brunch at the Pavillion Cafe there. Stroll over to the roundabout in Hackney Village for some craft beer (forgot the shop’s name but it’s right there).
Other than that I’d add Hackney Wick and Walthamstow (a little further out) as areas worth exploring if you have the time and curiosity.
Outside of East London (but very much still in London), I definitely recommend hitting Hampstead Heath (the heath/park), to enjoy the awesome views and vibes that can be had there.
For Berlin, I’d say…
…Tempelhofer Feld - It’s a tourist thing but it’s also a local thing. Awesome airport-turned-public-park and in the summer time you can spend a whole day there and not get bored. I also recommend going for ice cream at Erste Sahne on Kienitzer Strasse. The guy who runs the parlour (Dominico) is a true master of his craft and I’d say this is among the best ice cream parlours in Europe actually (I’ve tried them all in London, Paris, Berlin :)). You can also enjoy one of the many interesting options for food around Tempelhofer Feld, eg get an Acai Bowl at Aviatrix or go for tastey Galettes at Mama Kahlo’s. Tempelhofer Feld is huge, all my recommendations are on the Neukölln side of it.
…The Beuster Bar and the TIER bar for cocktails in Neukölln (both on Weserstrasse). TIER was once ranked one of the 25 best bars in Germany and the drinks you can get there are interesting, creative sometimes wild! If you dig wine or meszcal instead, check out Wild Things, also on Weserstrasse (European Tapas place with a dedicated wine bar and a dedicated Mezcal bar in the back). In general, that whole area (between Maybach Ufer to Sonnenallee and Kottbusser Damm to e.g. Wildenbruchstrasse) is beautiful and full of awesome places to discover.
…Insel der Jugend in Treptower Park is also wonderful. Cross the pedestrian bridge and enjoy a cold “Tank Bier” in a beach chair right by the water - or take a pedalboat out into the Spree.
…Klunkerkranich on Karl-Marx Strasse (on top of the shopping centre, you have to take the elevator inside of the shopping centre to P5 and walk the rest) is also a fantastically unique venue and with a great view over Berlin.
Lol I just love Neukölln man, bias advice here I just realise