I was in Montreal specifically to attend the Formula 1 race, so location was the number one priority for me. And Nader's place is located within a couple of minutes walk from the Metro station that runs to the track, so that was perfect for me.
I think it's fair to say that the accommodations are very basic. But, again, that is fine because I only needed a place to sleep and have a shower for one night, and the room and amenities were neat and clean (and about a quarter of the price of any hotel in town, if you're luck enough to even a find a room!). I also think it's worth mentioning that there is no entertainment system (TV/Stereo/etc). But there is Wi-Fi and it was fast and reliable, so, if you have your own device (who doesn't, these days?), it's not a problem.
Nader was very friendly and helpful and immediately answered any questions. I was able to self check-in/out, as well, which made things easy.