Great stay in the small loft of the duplex apartment. The family lives at the lower floor and there's a ladder between your floor and theirs, but everything is private - the bedroom/bathroom, the kitchen, the washing machine. Even the main entrance is private and separated. Besides there's a balcony.
The loft is well-equipped, has liquids, hair dryer, clothes airer. I'd say that it's a quiet place, where you can feel safe and sleep well, no noisy neighbours, albeit it's not fully isolated from the lower floor anyway.
The location is literally perfect! 5 min to Ünalan metro, 15 min to Emaar Shopping Mall, there are a LOT of different shops. I highly recommend you go to Unalan metro, then go to Kadıköy and theeeen ferry to Karaköy :) it's much cheaper.
Besides you may go shopping to Emaar (ehehe).
The hosts were friendly and helpful too, so I'd stay here one more time. Absolutely nice place.