The place itself is fine, it would be a good romantic getaway. The location is 15 min from old-town and not far from some great local restaurants and shopping. It is a beautiful city to walk around.
As others have mentioned, there are two bedrooms - and the bedroom facing the street is over a loud bar that goes till 2AM. If people are going to sleep there, they need to be resilient to fairly loud raucous noise.
Our experience was a bit off, as the building was under major renovations on the OTHER side. There was scaffolding (And painters and radios and electric saws) at 813AM 1 meter from the bed and spa bathtub. They finished at 4-5pm, but it meant that the bedroom and bath was not a great place to try and relax during the day. The other bedroom was not an option for sleeping per above. Maxime appeared not to know about the construction/scaffolding and did refund one night, which was very nice.
On top of that, the main road was being resurfaced, so we got dropped off a few blocks away with a bunch of (thankfully wheeled) luggage.
And the apartment is up two floors of stairs (4 flights), which was doable for us with luggage and a few trips, but there is no elevator and it might be tricky for older travelers.
Finally, we had a communications issue - Maxime had emphasized that we needed to be out by 11AM on checkout. I had asked and he said it was no problem to store luggage for 2 hours, so I arranged for a 2pm train and planned some last minute shopping and a lunch. This turned out to be a minor (1st world) disaster - it was cold and raining and the luggage "Concierge" office was across town and no one answered. I couldn't reach maxime to figure out which bell to ring. I called the number which was for AirBnB or a local BnB company (it was hard to tell). The woman said she spoke english but really didn't and kept repeating herself, and asking for the reservation number, even thought we had checked out. We spent almost 40 min in the rain with the luggage trying to sort it out before giving up on shopping and the lunch. I wouldn't have been perturbed, except I had written about this before we booked, and then during the trip. An hour later Maxime wrote back that it was All Saints Day (which shouldnt really have caught him by surprise) and sent some random links of places to store luggage - that would have been helpful the day before, or the months before, when we were planning, not an hour after we checked out.
Overall, it is a good place, in a pretty good location. I would recommend it after construction is over (unless you are there for a conference and really gone for the day, than it is perfect), with the caveat of the street-side bedroom needs a heavy sleeper, and you can do the stairs. And don't need to store luggage.