Had a very nice stay in Praca 66, near Metro station Marques and an easy walk to the city center. The apartment was large, we were with 10 persons and the rooms were ok in size. Some rooms have a private bathroom and the others share.
In general the apartment is fitted out well.
We visited in the end of November and it was a bit chilly/ humid in the apartment.
Good beds, might need duvets in the winter time, but the apartment had extra blankets we used.
There are some shops / supermarket and restaurants in the neighborhood, otherwise short way to center with metro or taxi/ Uber.
So, we would like to recommend this place to larger groups of friends / couples who want to enjoy a trip to Porto.
The host was very good and quick to reply and we could check out a bit later which was nice because of different departure times of the group.