The place is pretty much as it is described, here are some things you may want to know before booking.
Communication: is really good, he always answers the right way!
Location: It is very near Taksim, which is very central where you will do all your tours activities, the street is very narrow, full of local shops and people sitting on the sidewalk and there are many guys drinking and playing games, it felt really local, the street is a bit dirty and the buildings are very old, very typical of this area.
Wifi: In general is good but when it comes to access from the bedrooms you might not be able to use it. But in the living room works perfectly.
Cleanness: everything is super clean and the bed sheets and towels smell amazing, I felt at home.
The apartment: It is very spacious, it has good daylight, for summer is quite hot, but there are two fans that work perfectly.
The kitchen is complete you can cook there.
The bedroom is kind of isolated from the street so you can't hear anything, it is very silent to sleep, but it was quite bright and the curtains weren't ideal to make it darker, unfortunately.
The building: Is a bit old and dirty outside and the stairs, there is no elevator and the stair is a bit dark. This is quite important because the apartment is on the third floor and if you have too much luggage this can be an issue like it was for me.
PS: When I was looking for a place I set the filter for "self-check-in" mode, and Airbnb showed me this place, so in case you have done the same this place is not possible to self-check in.