I stayed at Ruben's for 2 nights. The place was clean, neat and cozy. Even though I'd mainly stayed there for nights to sleep, I felt very confy and relaxed somehow. It is also located in a quiet area yet easily accessed from the city centre on trams. Also found some lovely cafes and restaurants in a walking distance too. You might just want to be noted it has a steep stairs like many other places in Amsterdam do.
Last and most, Ruben was a great host. Flexible in checking in/out, Responsive to my messages and very helpful. Highly recommended.