Alberto was very helpful and accommodating regarding the booking. Due to a last-minute emergency I could not go to Porto at the end, but my friend went as planned and his feedback is the following:
"The place was neat and clean as described. Alberto was responsive and very accommodating—my flight got a little delayed and I missed the bus, he happily let me in late at night. The location is not central, but there is an e-bike station very close to the apartment, which made going to the historic center easy. Overall, I recommend the place."