Emirhan Apart Hotel Sultanahmet is a lovely remodeled guest house/hotel situated within the old part of the city of Istanbul. You'll find yourself just round the corner from Küçük Ayasofya, a short stroll from Cundi Park, and a few minutes walk from the seaview promenade where you can watch local fishermen angling in the Sea of Marmara.
With plenty of small restaurants nearby that serve breakfast, lunch, and dinner, at very reasonable prices, this hotel is a prime location. The Blue Mosque and Ayasofya are just a short distance up the hill.
The hosts are genuinely gracious and helpful, and can offer local tips on where to visit during your stay. Rooms are nicely decorated, clean, and well kept, come with a mini fridge and kettle, and most importantly a comfortable bed for a good night's rest.