Stayed three nights at Volkshotel, due to a conference at the RAI. Completely silent room on 6th floor, no noise whatsoever. Room was clean, a little bit «tired» but no problems. No cleaning before night 4 unless you ask for it, which makes total sense and could be adopted by more hotels. I was upgraded to a room with four beds which would be nice for a family, quite spacious. Staff was very friendly, and the reception area / bar had a cool and relaxed vibe. Breakfast was OK at best, I would go to a cafe instead if I were there on holiday. There is a metro station just outside.
All in all good value for money, I would happily return.