Nice place next to Galata Tower with amazing view from rooftop. As this place is located in a very busy area you should be aware that it is always noisy also at night.
Nearby there are many cafes and restaurants. Also you can reach the metro station Sishane within few minutes or if you walk 15 minutes down the hill you are at Galata Bridge with many restaurants and the ferry docks.
Omer is a very helpful host and is available on a short-term basis.
During night there is a 24 hours reception in the hotel next door.
All in all we had an amazing stay in Istanbul and definitely can recommend this place.