We had quite nice and long stay at Ersan's loft (did not meet him personally). The place is huge comparing of what you can get as an entire apartment. It is a former photo studio in the basement with all its attributes, a living space and big window with a view to the 'forest' yard.
I would agree with the all the previous comments. It needs some improvements, but the location (Galata tower and Istikal street are just few mins walk) and spaciousness of the loft are big advantages comparing to other places.