Highly recommended. I know Istanbul well so knew already what a great area it was. Near to the Istiklal shopping street, near the metro, and simply in a great location.
The staff were very friendly indeed, nothing was too much trouble, even when I asked where to buy some wine, they called out for the wine themselves and had it delivered.
The room was superb, a really nice bedroom, bathroom, and lounge. I really can't fault it at all. The only thing I would have liked as a non smoker, would be for it to be a completely non smoking building. I'm not sure it was. There is a fantastic terrace with immense views of the city and Mosque at Sultanhamet. It has a BBQ up there which I imagine would be fantastic come the warm weather. I would give the staff, location and rooms a good nine out of ten.