This place is very close to the metro rail. It was also very close to all the center of Amsterdam. We really enjoyed the location.
One minor complaint that I'm not sure could be fixed since it's probably the way Amsterdam plumbing works but the shower room has a strong odor of sewer system which could be pretty bad at times if you don't close the door to the shower. Other than that the room was very comfortable to stay in for the 3 days that we were in Amsterdam.
Nik is a great host and we would recommend this place if you're visiting.