We stayed at Bas' place for a week and we had an awesome time.
If you want to stay at his place, too, here is some information:
The Apartment: it is a beautiful flat, very clean unless you mess it up. The kitchen is fully equipped, so it is perfect to prepare your meals there. The living room is comfortable and you can use the tv (actually Bas lets you use pretty much everything, but please don't take this as a guarantee and ask ihm first). If you smoke there is a little balcony with a view over the gardens of Bas' neighborhood.
The most important room for you, the one you sleep in, is small but nice. The bed is actually really comfortable, although it might look like a sleeping couch, it is a proper mattress.
The host: Bas is the absolutely perfect flatmate for your time in the city. He is informed about everything and if you don't want to bother him with your questions, there is always a lonely planet in your room you can use. Bas also tries to give you the best possible time during your stay. And in case you aren’t interested in hanging out with your host don’t worry, he is working long hours. But I would definitely recommend you to hang out with him, he really is awesome no doubt about that.
Other information: The apartment is in a quiet street but only 2 minutes away there is a tram station, a supermarket, bars and much more. So you have a calm stay but action is around the corner. The Hallen is also about a 10 minute walk where you can have different Dutch and International food.
To summarize all of it: For me the Perfect stay in Amsterdam with an awesome host (I know I said it before). I will come back and recommend it to all of my friend and family and also all of you.