We had a very nice stay at Hakan & Turkan's place. The flat is clean, cozy, well equipped with pretty much everything you need, it is not very spacious but must be suitable for couples and solo travellers. It is located in about 7-10 minutes from Istiklal street in a quiet and authentic neighbourhood with small supermarkets at almost every corner. The hosts are very nice and helpful, communicating was really easy. I would definitely recommend this place =).