Location is great, it would be difficult to live more centrally and with less than 10 mins walk from metro. Pizzeria with good and reasonably priced Italian food (easily available for takeway) downstairs, bakery 50m away, small grocery store not more than 150m away. Taking into account the central location, the apartment is bit far away from any supermarkets (Trinidade area that might require a small metro/bus trip), but that was not an issue for us - we came to see Porto, not to go grocery shopping.
We (me and wife and 2 small daughters) had a great time in Joaos flat. It was spacey enough for all of us, quite suitable for small kids with not too many dangerous objects. Everything was clean, functioning and generally looked like in photos. Elevator worked perfectly, good sound insulation in the flat and no noise from neighbors. Also no noise from the street (that seemed generally calm), as the windows are open towards the yard.
Generally, very good value for money and a very responsive host.