We spent four lovely days in Amsterdam and our stay at YAYS definitely contributed to it. The location of the apartment we found to be very convenient to get into the center and the museum area, as the tram station is right in front of your door. The building is typical old Amsterdam, hence the steep and narrow staircase, so yes it would not be ideal for someone with mobility issues. The apartment was spacious enough, the bed and sofabed were huge, bedding was clean, the toilet and bathroom modern and clean. Overall, just like the pictures. There was some noise inside as the road at the front is a busy one and also although it's marketed as non-smoking I think we did smell a couple of times weed outside our room. All in all we had a very comfortable and pleasant stay, we would happily stay there again.