We stayed in the place for a month. and we liked it. The flat is really cosy and beautiful. The wi-fi signal was good and the location is convenient, just near the taxim square.
As for some negative aspects. It can be noisy for some people because it is just near the road, but we got used to it pretty quickly.
The host could not speak English, but was friendly and with translator we could understand each other.
Just know that there is no washing machine in the flat (we had to use the laundery. There are many of them near the flat).