Helena's place is 5-star accommodation. She and her husband came personally to see us in and to spend time showing us places of interest on the map. The interiors are done well and are significantly more luxurious than the pictures demonstrate. The place is well-appointed with a washing machine and a dishwasher.
The location is super central, with a bunch of the sights that tour operators would take you on, within 5 minutes walking distance. Helena's place in Porto is a must-book.
All in, A++.