Thule-Loft is a perfect and non-expensive place to stay in Berlin (if you have time, if you are here just for 2-3 days maybe a more central location can be better). Easy access with trams, U-Bahn and S-Bahn in a close area. Also some cheap and good places to eat at Prenzlauer-Berg.
Easy and autonomous access with padlock for keys. Frank compensates for his absence by his responsiveness and clear and precise information.
The place is even a little bigger in real life than in the photos!
Just not recommended for those who do not like to have light when sleeping because it is not really possible to completely obscure the windows!