I chose Marie-Christine's apartment because I was attending a conference at the Palexpo and wasn't interested in paying a fortune for the big hotels. As far as convenience goes, you cannot beat this location for the conference hall. It is literally a 2-3 minute walk through the park to get to the Palexpo from her front door. There is a CoOp grocery store around the corner as well.
It was simple- nothing fancy- but quite efficient. Decent bed, good wifi, quiet, clean and pretty spacious. It is very near the airport- so if you need to sleep with the windows open (no a/c) you will wake promptly at 6am to the sounds of jet engines. The windows stretch the entire length of the place- so you can lower the metal shades outside. It took me some time to realize you could do that.
The hall leading to the apartment is dark and had some very strong cooking smells from neighbors that seemed to linger the three days I was there, but Marie-Christine's place didn't smell.