This was our first trip to Quebec City and we quickly found that the apartment is ideally located to see everything in the older, most historic part of town. You can also walk to other interesting areas within 30 minutes or so. But the most famous sites are all within about a 10 minute (or less) walk. The apartment was as advertised - clean, well designed, and cozy. We had a very nice stay. Maybe it says this in the listing and I missed it, but it's a couple of flights up.
Tips: for lunch or dinner, we loved Chez Temporel, which is on Rue Couillard, less than 5 minutes' walk from the apartment. It looks unassuming, not glitzy or touristy, and has the most delicious French food and friendly staff. Do try it.
Parking: if you arrive in the dark it's easy to miss the recommended garage - Stationnement Hotel de Ville - as it's not well marked. It is directly opposite the garage called Chauveau (which is well marked with a glowing sign). Hotel de Ville is a few $ cheaper so park there!