We have had a lovely stay in Bárbara's apartment, and would definitely recommend it to others. We stayed there for a couple of days, and think the apartment is perfectly suited to trips like these. Centrally located, we have visited all key highlights of Porto, on foot from the apartment, just like the neighborhoods for dinner & drinks.
The host welcomed us personally and showed us around. We felt very welcome immediately and Bárbara was always quick to respond to our messages. Thanks again Bárbara!
Given the central location, do take into account that the streets are noisy at night (or at least they were during our stay).