I find it so rare to give a place such a good review, but this place was simply great. Our originally booked apartment had a small issue the day we arrived, but we were informed well before check-in, and ended up with an even nicer apartment. Communication was clear & friendly, check-in very flexible and easy (we arrived quite late).
The apartment, ease of access, cleanliness, & quality of the interior were all 5-star. I worked from there for a couple of days - it's a modern apartment with great internet, so no worries there. Facilities and small stuff (kitchen items / air-con / electronic window controls / bathroom items / coffee / tv). Absolutely stunning view of Porto from the balcony, and within minutes walk into the city or Porto, or Gaia.
I go to Porto regularly (family live there), and normally I try a different place each time, but I will be coming back here for sure :)