I found this hotel on the web, for me it is the best so far in Istanbul, easily accessible from the airport by Havaist Bus to Aksaray station, then a 10 minutes walk only. It is in the Fatih/Laleli neighbourhood, close to Sultanamet and the Mosques. The tram stop is 4 minutes away, the busses similar. I could walk to everywhere, including ferry stops, Taksim, Istiklal etc .
The hotel is clean and spacious, has washing/ironing facilities and the best breakfast buffet in Istanbul from 77to 11am, included in the room price.
Outstanding is their team: one member friendlier than the other, extremely helpful, fun, courteous and always available, day and night, online and on whatsapp.
Thank you Monaco for outstanding service!