Louis's place in the heart of old Quebec City was extremely convenient and well situated. All the restaurants and sites are a stones throw away. The apartment is updated, though as some have mentioned, there are certainly a lot of stairs since it is in an old building. We didn't mind as we found it eclectic and just part of the feel and experience of old Quebec City. Some others had mentioned noise since it is on top of a nice restaurant, though we didn't find this to be an issue at all. The unit does not have central air conditioning but there were two portables units, one in the main floor and one in one of the bedrooms upstairs. The heat wasn't an issue when we went since the weather had cooled down for a few days. Others reviewers have also mentioned water heating issues. Hot water was not a problem when we were there. The only thing is that the taps are backwards...left is hot water, right is cold water so that may have thrown some people off!
Louis was friendly and cordial when we first met him at the restaurant downstairs for check-in. He offered to allow reservations for our group of 7 even though they normally only reserve for a maximum of 6. We ate there on our final night there and it was fantastic! As for the apartment, the two minor inconveniences we encountered were that there was only one set of keys for our group of 7 (2 families) and there was no laundry detergent. Louis did eventually bring us some but it didn't come till the night before we were checking out anyway so we didn't need it anymore at that point.
Overall, I would definitely recommend Louis's place for those who want convenience, a great location, and don't mind walking up stairs.