Berlin is still cheap for a European capital city. Unfortunately Covid has resulted in price increases of very many things but you can still eat inexpensively if you shop around. Same with hotels - I've just returned from another short visit there and paid under GBP500 for 6 nights 2 stops from Alexanderplatz - and thats including the dreaded "single person supplement " as I'm on my own 😢
I’m happy you were able to visit all of these amazing places but I must admit I’m a bit jealous 😅 as a local I can’t afford to eat at these fancy yummy looking places. Even Döner has become so expensive it’s like a treat..
Really depends on what you'll be doing! I'd say for an itinerary similar to mine (where it's pretty food and bar-heavy), safe to have 250 euros at least. If you find yourself having leftover cash by the end of the trip, start using the cash instead of paying by card so you can finish it
