Do not hesitate to book this! It's the perfect location, literally walking distance from every single attraction in the Sultahnamet district, including Grand Bazaar. There are also hundreds of excellent restaurants within walking distance from this place. The rooftop terrace views alone are to die for, you get an incredible view of the whole city and the prettiest mosques, which are often lit up at night. The rooms are much larger than they appear in the pictures and fit with clean, crisp white sheets. All the bathrooms and rooms are very clean, with A/C in every single room. We stayed at 4 different Airbnbs during our stay and this was by far one of the best.
The only deterrent would be if walking/mobility is a problem then this might not be the best location since its right in the old city so streets are sometimes steep and paved with uneven cobblestones. There is also no elevator in the building, which is normal for this area, and the AirBnB spans 4 floors so lots of narrow stairs to climb!