Location - You need to use public transport to get to Benno's. so initially from Schipol airport, take the train from the airport to Schloterdeik, then catch the no. 19 tram and get off at Molenwerf. Benno's is a 3 minute walk from there. It probably takes about half an hour. You can also use the no. 19 tram to get to where all the museums in the centre are. If you're wanting to go out further to those 'other' districts then any tram or bus driver will help you.
Facilities - Everything was as described, with the addition of a hairdryer. A microwave would have been nice but we made do with fresh rolls and croissants and deli bits from the Lidl a few doors down. There's also an Italian restaurant nearby which we used and can definitely recommend their spaghetti :)
The Apartment -Though very arty and quirky, I never felt entirely comfortable walking on the glass floors, and the glass walls of the bedrooms didn't offer much sound protection from a snoring sister next door! :) It is not recommended if you have any mobility disabilities as the stairs are steep and the bath is exceptionally high to get into when you want a shower. (this may be because we Welsh are very short and Dutch people tend to be on the tall side.) The sofas are very comfortable, although we rarely used them as we were out site seeing for most of the time. The beds are ok, though we were mostly kept awake by a creaking noise most nights, once the lights were out. We couldn't decide whether it was the radiators making a noise or birds running on the flat roof. Probably wouldn't be an issue if you'd had a few drinks :)