Our last trip to Montreal was in 1977 - while much had changed, much had stayed the same. We hadn't explored the Plateau then, but thoroughly enjoyed it this trip!
Christophe & Alexis' place is right in the 'coeur de Montreal', with easy access to the Metro (which is fabulous and very easy to use), and within walking distance to Mont Royal, Vieux Montreal, the Latin quarter and all of the best Montreal has to offer. Fine restaurants, great shopping and other places of interest are all in short walking distance.
Our hosts were extraordinarily accommodating, and also met us at the apartment. They were kind enough to have provided coffee, milk and juice, and spoke to us at length about what few quirks their property had (parking signs were unintelligible to us, as neither of us spoke any but the most basic of French, and the nuances of the location of the signs needed to be explained).
I would rate the property excellent, excepting for the lavatory. Prepare to be on very friendly terms with whomever you stay with, as there is minimal privacy. Also, the shower curtain, as another comment had mentioned, is 'challenging' (it keeps wanting to stick to you rather than the sides of the old claw foot tub). As well, it tends to leak, so water accumulates on the floor - it can get a bit slippery. The walls of the tub are also a bit high, so getting in and out requires some agility.
Overall, we were pleased with the property - a good value with all you really need and the inconveniences were minor. Thanks again to Christophe and Alexis!