A friend from Porto recommended us to stay here. Overall it was a good pick.
Things to note:
Reception is not 24/7, they have another property nearby that is 24/7 that you can call if you need something, however, there are no phones in the rooms so you'll need to use your cell phone, not ideal for someone without a European cell plan.
Breakfast area is quite cramped and busy, there is a patio which is nice, although, typically filled with smokers. The breakfast itself is not fancy but it was OK, 1-2 fresh fruits + frozen/thawed berries, scrambled eggs, bacon, sausages, pastries/bread, cheese & cold cuts, coffee & tea. It was all fresh, but nothing is made-to-order.
The location is excellent, very convenient, we didn't experience any street noise, but you can hear your neighbors in other rooms coming and going and talking in the hallway. There is no elevator, stairs-only, not a problem for us, but possibly for some.
Overall, it was a good stay without any problems for us and we'd stay again.