The flat is beautiful (look at the pictures !), perfectly located (2 minutes from one of Porto's main subway stations). We stayed there for 10 days,5 persons, a period during long enough to appreciate the qualities and defaults of a place, and we could find no defaults ;) The host is really nice, caring, and really helpful. The city is definitely worth a trip (although if you are a good walker, 10 days may be too much). One nuance maybe: the mezzanine is probably to be reserved to children and young adults.