Where to start! ... Lovely people couldn't have been more delightful, willing or helpful and gave us a superb restaurant tip. The house dates to 1671 and the room is located at the very top with open gorgeous roof beams and tons of character. It is spacious with a seating area, kettle and fridge and large terrace. Everything is provided down to shampoo and loads of towels.
It is situated minutes from the Rijksmuseum close to the Prinsengracht with plenty of choice in restaurants, bars, cafes and the Vondelpark is only 10 minutes away.
I am loathe to praise it too highly in case it is not available the next time we wish to visit Amsterdam.
The stairs are really really steep as would be expected but I don't think they are a problem unless maybe you've had a hip or knee replacement recently!