We were happy to stay at Margarita.
The flat is good and looks like in the photos. A plus was the mattress, I have the same one at home and my back was happy.
A tip for travellers, Margarita left an Istanbul map in the hallway of the flat. Take it with you, otherwise you will have stress when buying tickets, as the machines accept a maximum of 15 or 40 Lira, and it is not possible to get change of 50/100 Lira.