I stayed here for a 3 day weekend and explored Porto. I like the location of the apartment, it’s not quite in the center but it is close enough, about 20 minutes walk down to the riverbank. The return to the apartment is mostly uphill, but you can’t avoid hills in Porto, so I don’t count that against the apartment. The bed was nice and comfortable with two air conditioners in the unit. I used them for heat but I imagine they are very good in summer. I would consider bringing your own toiletries like soap and shampoo. If you sleep light then this unit may not be for you. Bars open late and the street beneath is packed with people and bars until early morning. I had issues staying asleep even with earplugs.
For people looking for a quick and good breakfast try Mercador Cafe, one of few spots with good service. Tapabento for dinner was excellent, as was Puro 4050 (sister restaurant of Cantina 32, which is also highly rated but seemingly impossible to eat at without reservation).