We were extremely pleased with our time at Hendrik and Betty's 'Green Room' in Rotterdam.
Although we did not meet Hendrik during our stay, Betty was very friendly. She provided us with instructions to find the place via public transit, and greeted us warmly upon our arrival.
They exceeded our expectations in providing a true 'bed and breakfast' experience. There were a number of city guides and maps, including a book that we used every day to find fantastic food and landmarks: 'The 500 Hidden Secrets of Rotterdam.' A mini-fridge was stocked with essentials (and more), and we were able to enjoy a meal with coffee/tea in the morning before setting out to explore Rotterdam. There were plenty of fresh towels and linens, and Betty made it clear we could let her know if we needed more of anything. There were also a number of toiletry items available, which was useful when we needed extra tissue for our stubborn colds!
The place was spotlessly clean and very cozy. The bed was so comfortable, it was always a struggle to get out of it in the morning! There was also a ton of books, cable TV, and an excellent Wifi connection to keep ourselves entertained.

We would highly recommend Betty & Hendrik's 'Green Room' to anyone visiting Rotterdam.