We spent three nights here on our first visit to Koh Kut and found the resort to be considerably better than several reviews from a few years ago. Ao Phrao Beach is almost at the furthest distance from the pier where you arrive, so expect a 45-60 minute songthauw transfer (included in the price of all BoonSiri catamaran tickets)
The resort sits in beautifully maintained and colourful gardens right alongside the beach. It's quiet and peaceful. The staff (Cambodian?) Will try their best to help. Midweek, only around a third of the bungalows were occupied, though numbers were much higher at the weekend. The beach is perfect soft sand, about a km long, shelving very gently into the sea - perfectly safe. Beach beds, snorkels, kayaks all included.
We tried several restaurants at this and other resorts - not much to choose between them.
The nicest bangalore were the recently constructed Garden Villas, with an interesting and light interior design; a range of other bungalows were older.
Yes, you get some Russian visitors ... and Chinese, and French, and Swedish, and Dutch, and British, and Thai - all looking for a remote beach holiday experience.