I booked Sarah's room for my father who was visiting me in Porto. Sarah and her aunt were very helpful and flexible regarding his arrival time and everything went smoothly.
The flat is in a great neighborhood with close proximity to shops, bars, cafés, restaurants as well as metro and buses (but the center is within walking distance so you may not need to use public transport all that much).
A great place to stay for travelers who wish to have a base from which to explore the city. The room is small, and has no window - so a place to rest, really. Porto is a magical city and I encourage anyone to get to know it!