This hotel is located on a quiet block halfway between the central railway station and the museums (Van Gogh, Rijksmuseum), in the middle of the historic part of Amsterdam. Very convenient for our trip. We were able to walk everywhere.
We arrived late, and thankfully were helped with the kiosk check in that some people have made remarks about. Have your reservation number(s) handy...
The breakfast was superb with a wide selection of everything (both English and continental). A machine that makes mini pancakes is rather special :-)
We were 2 adults and 3 kids and were able to get connecting rooms. The beds were very firm, but surprisingly comfortable even so. The rooms were nice and comfortable. They were on the 5th floor in the back and were quiet all through the weekend. No complaints really.
Nits: We never understood the air conditioning controls, but were not bothered enough to call the front desk. The shower soap pump was defective in one of the rooms; The front desk supplied a new one within minutes. There were some marks on one of the walls, but not enough to break the wallpapering.
Some words on the booking process: Getting the connecting rooms was an adventure. Radisson has a very effective central booking function which very effectively deflected with "connecting rooms are subject to availability" and also sometimes "none are available" and prevented contact with the hotel about this. So I had given up on that. Fortunately we had one request in the booking that made the person allocating rooms contact us and she was able to change our booking and arrange connecting rooms (Thanks!!!). I think Radisson Blu made this a stupidly high hurdle and should be able to accommodate families better. A request like like "We'd like connecting rooms and are willing to change our reservations to accommodate this" might also work.