Embarrassingly enough, I stayed at this hotel by accident, intending to book at the Renaissance Polat instead, but then just decided to go with it once the reservation was made. It is a very average airport hotel in every way. They do have a free shuttle back and forth to the airport, but you must be lucky to catch it as it stops only once an hour at the international terminal only. The hotel told me every half hour when I called to enquire so thank goodness I caught it fairly quickly.
Check in was a disaster as there was an entire lobby full of TK passengers they were accomodating whose flight must have been cancelled. Not the hotel's fault obviously, but the wait to check in was an eternity behind this group. The reception agent was however very pleasant when I got to the front.
The room was adequate, but nothing particularly special. Dinner at the one restaurant in the hotel was subpar and the service was exceedingly slow, so that is a minus. Breakfast, as is typical of airport hotels, always seems to start long past the time folks need to be at the airport in the morning, so I didn't partake.
In summary, this is a very no-frills, typical airport hotel charging high prices. I wouldn't not recommend it, but I think better accomodations can be had for overnights near Istanbul airport.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC