Lovely apartment! Great location, if you want to explore this side of the city or go out. Very close to Taksim square, not far from the tram. The view is fantastic from every room.
It's located on the last floor with a very narrow staircase, so be aware that there's no elevator if you have heavy bags. The building is on a hill so walking around you will have to come up many stairs in Cihangir - it's all like that there. There's also no air conditioning, it was mostly ok in early June with open windows but in high heat might be a little too hot inside.
I loved the design of the place and the apartment has everything necessary (washer, coffee machine, towels, cooking equipment). The wifi connection was very stable, around 100mbps - perfect for remote work.
It was a little loud at night, I think there are some clubs/bars, but if you sleep with earplugs or are not bothered by noise easily it's fine.
Both Devrim and Sule were very nice hosts, we had a lovely chat, check-in/out was very easy, and all the communication was great. Orhan also helped me with the bags when I checked in, they've always replied fast to any questions I had.