I was combining 3 days of work with 3 days of leisure.
The hotel is a bit difficult to find in the beginning, the taxi drivers don't really know that tiny street. The surrounding is all under constructions, so even the street lights were not working when I was there - pretty dark at night.
The staff is extremely friendly and helpful. But I did suggest to them to please create at least one page of general information - there is nothing! I had to ask how the safe works...
When you come from the main street, you are actually at the back of the hotel. You can enter there, but have to go stairs down to reception. My room was on the same level as that back entrance, where you also find the restaurant. Now I could ENTER the restaurant from that level, but not EXIT. There I had to go down to the reception and then up again.
Room was clean and functional, with a nice firm mattress on the bed.
The excellent METRO system has a station (Gayrettepe) about 10 minutes walking distance away - very convenient (buy an Istanbul Card, load it with money, use it on all transportations like busses, trams, even ships)