We are pleased with our stay at Neva's place. We spend only one night at that place, but could make the reservation without any problems, with very good communication.
Ogul was very friendly helpful before and during our stay.
The place is very central, safe and at one of the most beautiful streets in Beyoglu. It can be noisy until late at Weekends (because of those local bars around) , but that did not concern us.