echokilo - I must admit I've had trouble finding a hotel in Amsterdam that meets my requirements (twin beds, en-suite bathroom, hairdryer, room safe, no steep stairs, or at least a lift and preferably breakfast). Some of the hotels are just too trendy for their own good, with baths in the middle of the room or with clear glass walls between the bedroom and bathroom. Not even sure I'd like this if I went with Mr Spudqueen let alone a friend! Anyway, we've settled on the Hotel Nicolaas Witsen, paying extra for a deluxe room as it's slightly bigger (some of the hotels seem to have very small rooms, including some L-shaped with a bed in each part of the L!).
Just be careful about when you book if you're into museums and art galleries as both the Rijksmuseum and the Van Gogh museum are having the finishing touches put to their refurbishments and I think that both will be closed completely for a couple of weeks. We're going in about 6 weeks when we won't be able to visit the full museums, but will be able to see their most famous exhibits, the Rijksmuseum is in just one wing of the building, and the Van Gogh has moved to the Hermitage Amsterdam.