What a great spot! We stayed for 4 nights through NYE 2020.
It's down the street from some great boulangeries and directly above a decent coffee shop to get your morning or early lunch going. It's about a 17-18 minute walk to Old Quebec, 15 minutes to the Plains of Abraham (in the snow and ice), and 15 minutes or so from the Gare du Palais train station if you're taking the Via Rail.
The unit itself was very easy to get to, there's a wall of lockboxes directly outside the front entrance (next to the coffee shop). Clean inside, nothing too fancy. The Murphy/wall bed was just enough for 2 adults. I'd recommend bringing a Chrome stick or similar if you want to watch Netflix on the TV. We had no issues with wifi on any of our devices. The only thing I'd really recommend for folks considering this spot is to bring earplugs if you're a light sleeper. It's a wood truss and subfloor building, so you hear every step of the people above you. It really doesn't matter how quietly you walk :) As such, the walls are pretty thin as well.
All in all, I'd definitely recommend staying here, especially if you're looking for a good spot to launch from to explore the city! If you checkout and have a flight much later in the day, I'd recommend checking out bagsaway.com, which has several spots in the city to leave your bags for about $1/hr. We opted to do that as checkout was 11a and our flight didn't leave until 4p. It worked out swimmingly! If you are traveling via Via Rail, you can leave at the train station for $6. You do have to show you are arriving or departing with a boarding pass dated for said day.