I have stayed in this apartment for 7 days, everything about the apartment was great; clean, neat, spacious, it can host up to 5 persons, location, classy, different and the host was great.
Some consideration must be taken into account - Based on my experience -: Washing machine, dryer and electrical machinery are in Turkish, so get ready for that. The apartment is on a hill, so if you have elder people you must restudy it or use Uber most of times, there is no elevator and the stairs are spiral but I don't think this will be an issue. Bedroom has no AC, it is not that hot but if you like the chill feeling to sleep you may want to sleep in the living room.
The location of this apartment is great; it is near to many attractions on a walking distance; Ayia Sophia, Sultanahmed mosque, the basilica cistern, grand Bazaar, Egyptian bazar, tram station, archeological museum, Topkapi museum, Eminonu, beach, playground for kids, wholesale market, good restaurants. Actually, if you want just to chill you can spend one whole week in this area. Shopping souq is near by is awesome, cheaper than any place around.