I would honestly say that Hotel des Arts was a 3.5 stars.
The price was cheaper than the other places that I had researched on. The hotel looked pretty old on the outside, which was pretty neat. Parking is sort of a pain because there are limited street parking outside of the actual hotel, and you need to follow the parking street rules of Montreal as well. They do give you a paper with directions to the nearest parking lots, which are still limited spaces as well. You have the choice between $10/day or $20/day for parking, depending the closer lot that you choose.
The staff weren't too friendly. That's what lowered the rating for me. Weren't happy, didn't look like they wanted to be there. The front desk person didn't greet us first, we had to.
The room itself is decent. Definitely not bad for the price. Small, but its a nice place to rest your head at night. Refer to the pictures. TV in the room. No fridge.
Overall, I might stay here again for the price.