I have always wanted to see Europe from a River Boat but to this point have restricted myself to Cruises from and to European Ports. I am 60 years old retired male and travel alone. Can anyone tell me if the River Cruises have single cabins without the hurrendous supplements. If they do, are these very very small or would you say they are ok. I dont need to spend a lot of time in my cabin as long as there are places on the boat to sit in comfort and watch the world go by. Any info greatly appreciated.