The staff at the Greet hotel were super; we stayed on two separate occasions over the Easter holidays. The hotel is extremely clean, and they provide a good breakfast. There is also free parking on a first-come, first-served demand, and the hotel is about a 15-minute easy walk to the historic centre of Colmar.
The double/twin room is quite compact and not an issue unless you're planning to spend lots of time in your room besides sleeping!