The apartment is spacious and decorated very nicely. Water pressure in the shower and bathroom sink are awesome (especially if you are a woman with long hair). Internet connection also GREAT. Fast and stable! There is a REAL kitchen with a proper fridge and gas stove. You can do real cooking here. This is great for long term stays. There is a good supermarket directly accross the street. If you don't feel like cooking there are lovely cafes a few steps away, literally. Also pretty much next door is a houshold supply/drug store. If you need a screwdriver, hairdye, cleaning supplies or fresh eggs, that's the place to go. Cihangir is a great neighborhood, centrally located but very livable.
Note: The apartment is ground floor half basement. Makes it nice and cool in summer (in winter, heater works awesome, so no problems there either). But it's not getting too much daylight. Something for sun worshippers to keep in mind. Also being a bit at street level you get some noise from traffic. So if you are a light sleeper, you might want earplugs, especially if you like to sleep with your bedroom window open. It's good to be straightforward about such things. I was ok with it. And the apartment and host were great overall that I was cool with a bit of city bustle.
The host provides a great starting package of supplies like spices and food staples, toilet paper, paper towels, etc. If there are any difficulties he responds immediately and is super kind in fixing the issue. So this host's ranking as "superhost" is well-deserved. Having a good host/landlord is super important here in Istanbul. So this alone makes the apartment a gem.
All in all I very much recommend this apartment, and I will stay here again. Good location, good apartment infrastructure (water pressure, internet, kitchen), fantastic host.