Muharrem and his wife are very nice people-- genuine, thoughtful, family people. Their house is authentic and homely, with a great lived-in feel. If you want a sleek, faceless hotel-style space, look elsewhere-- but if you want to feel like a local resident of Istanbul, we can't recommend this place highly enough.
You can easily walk to all the sights in the old city-- the blue mosque, the hippodrome, hagia sophia, the basilica cistern and the topkapi palace are all within 10 minutes walk!
Great for families with kids, as there are two single beds on the middle floor, as well as the super-comfortable master bed on the top floor.
Muharrem and his wife are very helpful, with great local knowledge and advice, always available, and reply very promptly. We only wish we could give more than five stars.