The appartment is at one of the best locations you can wish for. It's in the centrum of Porto, at the river, in a very quite street and building. The building is quite new and comfortable. Just like the appartment itself. Lots of space, enough for 5 people. We were with two, which felt absolutely like a great luxury.
Luis very friendly and helpful. He takes all the time you need for stuff like checking in and out, even though is a pretty busy guy.
Also we had dinner at a restaurant of his recommendation: A Grave. One of the best restaurants we went to in a while!