Charlie is an excellent host, one of the most welcoming and friendly people you could hope to meet. I had some great conversations over a beer with him. He also provided good local tips for transport and shops, which are all located within 5 minutes walking distance from the room. Getting into the city centre is very easy from where the room is located.
The room itself was really comfortable and the whole flat is well maintained and tidy. I'd highly recommend staying here if you're visiting Amsterdam.