I've stayed at Irem's loft twice now for a total of 3.5 weeks, including 3 weeks in Feb/Mar 2020. It's exactly as described - some extra perks - there are several small stores across the street and it is quiet despite being off a major road (bonus: easy to find taxis). About 2 blocks from the main "action" in Pera district/Istiklal - again, quiet! It's near a small-ish football stadium (no rowdy crowds) with infrequent games that end by 10pm. It is on a hill directly over a lightly-used parking lot; there is a lovely view of parts of the city.
The bed is very comfortable and there are blackout shades. Some complained of a smell in the bathroom - I stay in Istanbul a lot and you can experience this in many buildings. There was only a bad smell when I stayed at the loft for a couple of hours (out of 3+ weeks). The only inconvenience was there is no washing machine.
The studio space is perfect for one or two.
Irem is very kind and generous. Communication is not always immediate but I usually hear back within the hour. Would definitely stay there again!