Alpay was very helpful and welcoming from the beginning, helping us to carry our luggages up the 3 floors. Alpay loaned us his 4G hotspot as we had no wifi due to a problem with the provider in the area, which was really convenient.
The appartment is very well decorated with some vintage stuff and literally spotless. The street is full of life during the day, many shops selling electrical products but no tourist stuff. Very quiet at night which is not the case everywhere. Within 3 min walk you can reach Galata tower or SALT Galata (contemporary art center, library and café) down the street. Galata bridge + Karakoy ferry pier to asian side are around 5 min by walk.
One of the best experiences I've had untill now.