The apartment is quite nice and the location is probably one of the best in the city. It's very close to the metro and Isticlal street and yet situated on a quiet street without lots of people. Many small shops around where you can buy everything you need.
The beds are very very comfortable and the bathroom is clean and nice. We didn't use much of the terrace since used the apartment mostly to sleep but it's really nice as well though the cats are rather disturbing (of course if you like cats it won't be a problem for you).
Two times there was no water at all in the apartment but I think it's the problem of the city in general.
Isik is a very nice person, he told us everything we needed to know about the surroundings. Thanks!