There is always a trouble moment for me when I use air bnb: the house keys. Every house you stay at has its own character and with it comes a "key trick" to open its front door. As a guest, you will have to learn that trick to use it just a few days. I use air bnb quite often, at that moment (how the keys work) is a stress moment for me. Marielle & Tobias must know that because they don't just have a great accommodation in Amsterdam, but the keys at their place work perfectly. No tricks. It was smooth as the whole place itself: cozy and convenient. The owners are also generous. I am from Brazil: I feel cold in Europe :). Marielle & Tobias kept the heater ON for me. Besides, a friend that was staying at their place offered to bring me a tea when I had a flue = Priceless.