I enjoyed my stay at Hampton by Hilton. I stayed for 6 nights and the staff was great. The accommodation matched what is expected by Hilton-- but the food was even better than Stateside.
The breakfast staff was the greatest... overly accommodating and made me feel right at home. The front desk reception was pleasant and attempted to assist me with all my requests... despite my deficiency with the Turkish language. POINTER: For English speakers, I found that if you know Spanish, many of the Turkish understood Spanish better than English.
If you like being around action, this is not the hotel for you. It is quite some distance away from the livelier parts of Istanbul. I found myself in Ubers often. It is situated in a residential area with a little shopping area conveniently located next door (which was a BIG plus). This shopping area has stores, restaurants, barbers, etc.
Even being away from a lot of the activity, I'd probably opt to stay at this hotel again if ever in Istanbul.
Overall... Istanbul had beautiful people, excellent food, and good times!