We used this hotel during a long transfer in Istanbul on the way from Russia to Europe.
The Ramada Plaza by Wyndham Ataköy Hotel, which provides 5-star comfort and convenience, left the most positive impressions in terms of the composition and quality of the services provided with such options as a restaurant, an Irish Pub Ataköy bar, a rich and high-quality breakfast, an indoor pool (small, though), a sauna (also small), Turkish bath, massage (for a fee, apparently), gym (fitness center), satisfied our request for a high floor, as we assumed the presence of magnificent views of the sea and the city.
Photos and videos from the hotel are here:
https://dzen.ru/a/ZfxoBjXn-x-AXjND
Great hotel. Clean, neat. A good breakfast. Excellent location, 5 minutes walk to Bakyrkoi metro station (Marmara), 15 minutes to the bus from/to Istanbul airport, near two shopping centers, many restaurants.