I could not find a better place for a 3-night stay in Porto and also such a host as Barbara is - are very special. Really not more than 300 meters from the tube station Sao Bento is a great value if you want to see also the life in the suburbs a little more away from the city center, take a tube to the Atlantic coast, take a tube on return from a long walk or go shopping to one of big shopping centers.
The location is excellent for a short walking tour around the city.
Minipreco market with a selection of fresh bread and everything you need for everyday's life, is 200 meters away, difficult to find, and opens at 9 (closes at 8).
For those who are in Porto for two or three days only, I would recommend the following three things to do:
1. Clerigos Tower (you see it through the window of the apartment), 4 euros entry, from the top, you see all the town; very interesting to climb its 227 steps - you have a personal contact with a lot of people going in the opposite direction...; more on Tripadvisor;
2. Free Walking Tour, that one of Eugenia, listed on Tripadvisor No.1 free walking tour. Was intended to last 3 hours, but we were walking around the city 4 hours. Book well ahead, at least one week; more on Tripadvisor;
3. Take a train to Braga, costs 3,15 euros + 0,50 supplement for a paper card (!); not refundable; trains from San Bento each hour, on Sundays not so frequently, seniors older than 65 have a half price (on the show of your document wit a photo at the counter). Visit Bom Jesus do Monte, from the train station take the bus line No.2, could wait for it up to 45 minutes... Local bus timelines are not reliable; more on Tripadvisor.
Barbara's apartment is spacy. Comfortable bed in the sleeping room, big windows with a view on Rua do Suoto. Kitchen is equipped with everything you need for an (also not so short) stay. Very nice welcome with little glasses of wine and home made jam.
If I could do overall rating, I would give 10?10 points.