My wife and I had a very nice stay at Merv's apartment. She was very helpful, responded extremely quickly when we asked her any question and gave good tips about the neighborhood.
The apartment is very well situated in a nice and calm area with lots of restaurants and cafes. 10 minutes walk from Taksim, metro and train stations. Very close to Carrefour Market which we found very useful.
We thank Merv for her hospitality and we strongly recommend her apartment (unless you cannot handle the 3 floors of stairs).