We travelled in Russia along the Volga River with Scenic in mid-to late June 2017. Be prepared for weather that's on the cool side - mid-teens - and expect some rain. My puffy jacket, boots, umbrella, heavy weight cotton pants, long sleeve tops, and sweater that I had packed got good use on those cool days we were out sightseeing. All of the museums have free coat/umbrella checks so it was comfortable viewing displays indoors.
For me, being dressed comfortably for the weather helps me to enjoy the trip.
The most important thing that I look for when I book a cruise is the itinerary. This cruise was well named for the 2 jewels on this cruise were Moscow and St. Petersburg for me. In each city our itinerary allowed 4 days. These 2 days were very busy with early starts and late nights while the other 4 days, cruising on the Volga to visit 1 small rural town each day for 2 hours, were very relaxing. We booked Scenic's Volga cruise because of their sight filled itinerary and discounts offered to previous customers.
Spacious cabins with comfortable beds and bedding. Duvets become too hot during the night. 3 piece white tiled bathrooms were clean and fresh but on the small side. Toilet was noisy like on airplanes. Configuration for hanging clothes was odd so it limited the number of clothes to be hung. Blackout drapes cut out early morning light. Lots of outlets. Floor to ceiling sliding glass doors opened onto a private balcony just like on a cruise ship. Rooms were clean, well lit with natural light, well maintained and maid service was as expected. Turn down service provided chocolates as well the program for the next day.