My partner and I spent a week in Alexandra and Catarina's place. We communicated with Catarina during our stay and she was a perfect host, very responsive, welcoming with our requests and keen to give us tips about Porto. The house is tastefully decorated and well equipped for short stays. Though the apartment is on a busy street, the triple-windows assure a good isolation from outside noise. The isolation among rooms is not great and indeed guests coming, leaving or using the bathroom at night might disrupt the night of the less heavy sleepers. However, overall it was definitely ok, noisy-wise. We stayed there for working remotely and not for holiday which is not ideal as guests are usually on vacation and have time schedules not aligned with those of day workers. But if you are looking a comfortable, cute and well-located base to explore Porto, then I definitely recommend this place!