My mother stayed in Fuar hotel.She was very pleased with the service and the stuff at the hotel. Also, the hotel is very close the old city and metro, other transportation.The room was very clean, the staff in reception was friendly, the price is convenient in comparison with other hotels, the breakfast was with variety and delicious.
Stayed there for 3 nights; rooms were pretty basic and so was the food.
Its near by the 'hot spots' Sultan Ahmet, Aya sofia, Grand bazar and Topkapi - very walkable distance!
The hotel is also near the Tram station and the Metro stations, if you need to go to Taxim and other districts.
Location wise its pretty fine. If you're on a tight budget, then I recommend it for you.