Awesome apartment! Good location, less than 20 mins walk from Dam Square, and there are plenty of amenities near by.
Guido uses a butler / cleaning service - when we arrived at the apt (much earlier than check-in time), we rang the provided number and the butler gave us the door code. Didn't meet the host or the butler all weekend, and had no issues other than I couldn't get the TV to work - but we don't go on a city break to watch TV, so it wasn't the end of the world!
Brilliant apartment for two people - spacious and well stocked; more stuff was provided than expected - all the basics and a bit more are provided.
Quiet location, though as with most old Dutch houses, you could hear the neighbours walking about a fair bit. We had complete privacy, which is generally what we look for when we go away.
I would say that staying at Guido's apt is better than a 5 star hotel experience - obviously without the room service and concierge! :)
We left a pack of cards on the shelf for the next couple, in case they also can't get the TV to work :)
Highly recommended - we'll be back in a flash if Guido will have us :)