Our stay at Sufi apartment was very convenient. We were a family of 10 (6 Adults and 4 kids), spending a week in Istanbul, so the two apartments were very convenient. The apartments are centrally located with lots of restaurants, bakeries, convenience and souvenir shops, and tour agents nearby; all the Sultanahmet sites & the Grand Bazaar were within walking distance (although the walk to these places was uphill).
The apartments were very clean, fully furnished with all amenities, including basic requirements in the kitchen. The owner, Farouq, is very helpful and easy to contact; as is Murat, who helped us set up.
We highly recommend Sufi for a comfortable, cosy and convenient stay!