I can't emphasise enough how perfect this location is if you want to walk around the historic heart of Istanbul. The flat itself is a good size for up to 4, basic but everything you need and well maintained. Mehmet was very quick to respond to any query and also has a lovely, helpful neighbour in the jewellery shop next door. Loads of places to eat in the vicinity. The general area feels both safe and clean. I'd recommend the free walking tour for handy tips, one of them being to visit the Hagia Sofia in the evening; it's actually open until 11 and pretty quiet after the last call to prayer. Such a beautiful city.