Location could not be more perfect, conveniently a short walk from the main metro station of Trindade and pretty much anywhere else you want to go - at the same time nested in a quiet alley protected from traffic.
Edu was very forthcoming and responsive with all communications, the check in/check out process was seamless and the apartment had everything I needed for my four-day trip.
When I come back to Porto (and I definitely will), I will surely try to book another stay.