We stayed in Taner's place for a week and we enjoyed it. The apartment is small but had everything we need as a family of 4 plus a baby. Heating worked very well, shower always has hot water, kitchen has all the items we needed and internet was sufficient, not the fastest (around 10Mb), but good enough for some online work and meetings that I had to do.
Location is great, in a pretty neighborhood and within walking distance from many attractions like Hagia Sofia and Sultan ahmet mosques and only around 10 minutes to the nearest tramway stop.
And our host was very responsive and helpful with our requests, I totally recommend his place and would definitely stay here again in the future.