We enjoyed our stay at Nathalie's loft. It's a small space but it's nice, clean and bright. The place was well situated, within walking distance of lots of cafés, restaurants and pubs. There is also a small grocery store nearby. It's within walking distance of Old Québec (15-20 minutes) or you can take the bus (we walked there and tool the bus back).
The bed was very comfortable but the hide-a-bed not so much, but that is pretty standard for those beds. There was some construction, as mentioned by other reviewers, but you could barely hear it with the windows closed. The A/C works great, which is a benefit in this humid heat! We were missing a couple of pillow cases but Nathalie was very responsive and helpful and made sure we had everything we needed in a timely fashion.
This place would be best for a couple, as opposed to 3 people, but we were still quite confortable. Very nice place to stay for a weekend in Quebec City!