While we never personally met with Ruben, he made arrangements to get us the apartment key, which worked out fine, and he stayed in touch with us to make sure that everything was okay. The apartment is quite serviceable and in a great location. As Amsterdam can be frenetic, it is away from the central hub, but only about a five minute walk to the bus/tram stop which gets you to the Center city quickly. It is also only three tram stops from the Amsterdam Leyleidan station which is a short hop to Schipol Airport. This is a quick way to access the airport, and in fact the whole European Railway system, without dealing with Central Amsterdam.

The apartment is quiet and overlooks a park, which is quite nice. Being in a residential area there aren't a surplus of upscale restaurants in the immediate area, but the downtown is accessible, and you won't starve to death locally. There also is a supermarket about 4 blocks away. The apartment is on the first floor, up a somewhat narrow, steep, and twisty stairway. This could present problems to someone with a lot of luggage, or with mobility issues. We are 68 and it worked out fine, but I'm not sure I'd like to try it again in five years. The bed also runs the full width of the bedroom, so getting in and out requires some agility for two people to manage.
All in all it was a great stay, and the plusses far outweighed the few minuses.