That's nice and authentic place. You will find it on the other side of Porto, but still very close to all the central activities. I'm not sure about the subway (I mean, it's not so close as we expected), you should take a train to subway with the interval of 10-15min or walk about 15 min to the subway, but Uber is really cheap (about 5-7 euros to subway), or you can walk down to the river about 10-15 min to find restaurants.
Also you should know, that there is a limit of hot water, but perhaps this is regular thing for this region. But anyway, it's enough for one person and another one should wait a bit for new portion of hot wanter :)
Armando was so kind to welcome us at night, as our plane was delated and we arrive about the midnight. Also he was in touch by whatsapp. So we are very happy to stay at this place.