Cankurtaran District Akbiyik Avenue Cetinkaya Street No.1, Sultanahmet, Istanbul 34122, Turkey
The Osmanhan is a great little hotel just 5 minutes from the Blue Mosque and all the other sights in the historic part of Istanbul. The price is also unbeatable.
I stayed in a standard room on the ground floor. The style is a bit old fashioned, but it's very clean and has everything you need - even free WiFi!
The staff were so friendly and I really enjoyed breakfast each morning on the rooftop terrace soaking up the views of the city. Highly recommended if you have a small budget.