Five of us visited Porto in July 2018 and this was the ideal base for a week exploring the city and surrounding area: it's very central (5 minutes walk to the pedestrianised area of Rua de Santa Catarina and 8 mins to Bolhao metro) but offers some respite from the bustle of downtown.
The apartment is spacious, well-equipped and clean with lots of cool decorative touches that nod to the building's 1970s' architectural heritage. The rooftop terrace is an atmospheric spot to soak up sunset views across the city with a glass of port in hand. Handily, Alexandra had kindly left us a bottle of tawny to welcome us!
Our flight to Porto was delayed 3 hours, so even though we didn't get to Aida's Haven til almost midnight, we were greeted with a big smile and a full rundown of the local area. She'd even set up a handy Google map with links to all the nearby attractions and places to eat and drink.
One slight word of caution (and not one that reflects on the lovely apartment itself) - there is a club nearby which seems to be open to 5 or 6am most nights. It didn't bother us too much, but it's something that may disturb light sleepers.
Overall, the place gets a big thumbs up from us and we'd happily stay here again if we were to return to Porto.