We had an excellent and very comfortable stay here at the Hotel Johannes Vermeer! Our room was as large and comfortable as advertised, with tons of space; the AC worked well and kept us cool even though it was quite hot when we were there. Staff were polite and helpful, and baggage storage both before we checked in and after we checked out was a breeze!
The location was second to none--it was easily accessible from the train station and right on the canal. It was walkable to pretty much every main sight of old Delft (a bit farther from the windmill but that's relative) and yet it was not a loud area, at least in our experience with a room not facing the street. Close to the grocery store, shops, restaurants/food, and the market that pops up on the street nearby. Couldn't have asked for more!
The room was clean with no issues, and we even used the Jacuzzi tub. The tub was less clean than anything else--there was some hair and when we used the jet (not the bubbles but stronger jets) function, they jetted out some build up/detritus, showing they aren't used much or cleaned regularly. Still, we enjoyed the Jacuzzi but would recommend an interior cleaning of the jets.