We loved our long term stay at Matrona's apartment. The place is very spacious and well located (near Istiklal Street), with one of the best possible views of the Golden Horn from the common terrace.
A big plus is that Matrona speaks good English, something that was a key factor to decide us, as communication with most of the other hosts that we contacted was hard and inconvenient.
Totally recommended. Beautiful and comfortable apartment, in a real Turkish neighbourhood and very nice host.