Great location behind the blue mosque in a very quiet area. The place is small, basic but good enough. Some rooms have nice sea view (a bit loud noises from the main road close by). The breakfast plate is good enough to get you started in the day.
Alihan responded very quickly to my messages. He organized airport pick up for me which was a relief.
Only 2 issues were weak shower and weak internet connector.
But all in all was a very good experience and I would stay there again on my next visit to Istanbul...hopefully soon :-)