The room was rather shabby and smaller than my garden shed at home - but the location made up for it: just a few minutes from the Blue Mosque, in a vibrant neighbourhood and with a nice modern bathroom as a compensation. The airport transfer offered was €45 vs €10 at the corner outside, and they all go into the same never-ending traffic; for a sole traveller like me it didn't make sense.
A note to anyone with disability or strength issues: no elevator, steep stairs. This was not specific to Sultan's Inn: it seems to be the rule all around. Make it to the top of the five narrow flights and you will be rewarded by a cute terrace view. Finally, the inexplicable net on the beautiful rooftop terrace: all the others around had an unobstructed one but I was told it was to keep birds and cats away. I'd be happy to take any number of cats and birds in exchange for a clear view.