I came to Amsterdam with a friend from the US. I love tiny houses and experiences in interesting places (I stayed in a boat a couple weeks prior to this trip, for example). My friend prefers a nice boutique hotel. These bridge houses have so much history and character, plus they're done up like a boutique hotel. It's a great combination of things my friend and I both enjoy! As testament to that, I extended my time in Amsterdam after my friend went home and stayed in _another_ bridge house, this time in De Pijp! Both houses were well constructed, had good ammenities and comfy beds. I definitely needed ear plugs to help with the traffic noise, but I usually do anyway. The locations were both easy to access and the design of the spaces were good.
Beltbrug was special because we got to witness a few bridge openings! It sounds at first like a fire alarm in a nearby building, but it's a warning for the cars/bikes that the bridge is going up. The location was great for exploring Amsterdam, near public transit and walking distance to great cafes and sites. We enjoyed Morgan & Mees for brunch and going to the Tulip Museum for souvenirs for family. We didn't get tickets to visit Anne Frank's house in time, but it's also quite near.
If you get a chance to stay in any of the bridge houses, I 100% recommend.