I thought the buffet offered in the Delta building was excellent! First, I travelled during COVID times and the buffet in the US is non existent. Here though we were offered oatmeal, buckwheat porridge, boiled and scrambled eggs, fried ham and sausages, pancakes and crepes, farmers cheese, jam, yogurt, hot teas, coffee and cappuccino options. The tables were spaced out. Plenty of seating.
There was a pool in the main building, a brisk 3-5 min walk from Delta, 350 rubles, free for my 5-year-old. They had a shower, a free locker, hair-dryers, a sauna and a 4 foot deep pool. You need to bring your own towels and slippers from the hotel room. The water was nice, warm enough to swim.