We spent 5 romantic days in Istanbul staying at the Denis House. All went very well, the hotel provides all services as advertised. They upgraded us for better 3rd floor room with balcony and view without any extra payment which was fantastic. Breakfast is basic (but good) with excellent view from the top of the house. The only issue was a bit "smelly" reception - I guess the smell comes from the toilets on the ground floor. Otherwise rooms perfectly kept clean! Airport transfer was bit pricy (you can get transfer for around €5 if you book in travel agencies around the hotel). So overall experience was good and I recommend this place.