We really enjoyed our stay at Buğra's apartment - a very nice, clean and well equipped place with the terrace being the absolute highlight. And it's totally central, only a minute from Istiklal street, Şişhane Metro station and the Tünnel.
As I had some work to do and conference calls to attend, I was happy that the WiFi was totally reliable and strong - which one unfortunately could not say about the water supply. The water pressure was very low and sometimes there was no water at all, which made taking a shower kind of a challenge. But this never lasted longer than an hour (and is typical for old buildings in Istanbul especially on the higher floors). So don't let this minor issue keep you from booking this wonderful apartment, just be prepared.
Especially as you should not miss to meet Buğra, who is the nicest and most accommodating host you could wish for.