Honest review:
Location is sublime, few minutes walk from all the historical places and also tramline cemberlitas (T1) which you will definitley take. Get an Istanbulkarte by the way.
Space: very spacious and great value for it. Not the most clean place to be honest but old building and it has everything you need( washing machine, dryer,...) Hard beds though.
The host and representatibe Dilliara is great. Very helpfull and quick response. Also arrange pick up and drop off to airport through her.
Great value for money and sublime location with good support. Was happy I could stay there.