The apartment was ideally suited for our travel purposes (young couple, 6 day stay in Porto). The apartment is spacious, clean and well-furnished with a comfortable bed, couch, small (but extendable) table and fast wifi. The kitchen is quite well-equipped: with three pans, sharp knives and a cutting board you can actually prepare a decent meal. The only thing you should keep in mind is that the building is quite noisy. You'll hear it when people walk around in the apartment above you, when people use the staircase next door and when cars drive by in the street. It was not much of a problem for us: at night it was mostly quiet in the building and we could just shut the windows . However, I can imagine it's more difficult to cope with if it's very warm (we were here in late July/early August).
If you don't mind a 10-15 minute walk to the city center, the location can't be better: there's a supermarket, a café and a good bakery literally next door where you can have a proper breakfast. Rosa (and Luis) gave us a warm welcome when we arrived: they sent us travel tips beforehand, showed us around in the apartment and remained available for questions on whatsapp. All in all: a definite recommendation if you're looking for a comfortable place to stay while you're out most of the day.