Our stay in this apartment was very pleasant. It was perfectly clean, which is something we appreciate a lot. The bed at the main bedroom is comfortable and warm (we did not use the extra bed as we were only 2).
Only downside is that this is a first floor in a centric street (even if narrow), and therefore there is noise outside. Most of the night it was quiet (few cars passing that street), but we could here the music from neighbour bars until midnigbt or 1am, as well as any passerby and the trash truck.
In any case, the overall was a good experience, nothing fancy but warm and homey. Very good alternative if you want to avoid more costly hotels. The location is great, walking distance from most of the top sights and close to "Pera", where you can fine nice and modern restaurants and bars.