We stayed at Christina’s place for 2 nights (it's now changed to a 3 night minimum stay). Having lived in Montreal previously, I can tell you her place is well situated. It's an easy walk to the Lionel-Groulx and Atwater metro stations. Even better, it's only a 3 minute walk to the closest Bixi station.
The room itself was sparse but roomy with an AC unit (surprisingly, we didn't need to use it in the middle of August). There's two other rooms in the unit (one being rented long-term by a friendly Brazilian guy, the other being rented as an Airbnb). What we didn't like: one of the perks of this place was the rooftop terrasse. However, Christina was doing work/renovations on it and neglected to inform us that it was unavailable for use, until we'd arrived and were being shown around. Disappointing. Other things to be aware of: shower pressure was weak, bring your own basics (oil, spices, etc.) if you plan to cook and the pillows were soft. One other issue was if we could store our luggage after checking out. Her original reply was "yes, always possible" and then her response changed to charging an hourly rate for this "service". We didn't bother with the headache.
For the price, it wouldn't be my first choice to return.