We have been to Russia and Africa with Tauck, and this was or first river cruise ever, although we have been on ocean cruises. The other reviews are comprehensive, so I will mention other points.
I recommend room 323 which is next door to Authur's where I could pop in any time for cappuccino, tea, cookie/snack to take back to my room, or to sit to see both sides of the river since this was the aft end. Just quick and easy.
Interestingly, the motor coaches we used had a bathroom, and we could actually use them. We have been on tours where we were not allowed to use the bathroom on the coach. What?