To sum up, 10/10 full score apartment. (Very nice and satisfying) - Strongly recommendable.
Clean house, clean furniture, great location (near Beyazit tram station, Ayasofya, Blue mosque, etc.) and kind+nice host.
They can offer pick-up service, change towels and empty the rubbish bin. If you are planning quite a long-time travel, your apartment would get dirty so easy. But this apartment can solve that kind of problem (whereas others don't in my experiences). You can meet the host frequently (like almost everyday) and ask him or her something that you need (I think this point is really important). So I strongly recommend here to you.