We stayed in Dugyu's apartment for a long weekend in February and it was a great stay!
Great location, just a few steps away from the Galata tower and near lots of shops, restaurants, cafés, etc.
Also very close to the metro and tram stops
Duygu was very available, answering all our questions, and giving us additional recommendations for things to do/see around Istanbul
Highly recommend for a couple's stay in the city