Fernanda is the PERFECT host! She is really sweet, really kind and really available when we need help (communication was really easy). When we arrived she welcomed us with a basket of fresh fruits, a bottle of wine and a customized map of Porto that she made with her son (with the best spots, public transit and other tips) - seriously, the sweetest attention!
The apt. itself is really great! The kitchen is fully equiped, ideal for people who enjoy having a great breakfast and a late meal after a day visiting the city. And the place is really neat and super clean - the bathroom has even a towel heater, we were super surprised! Even though there is no washing machine, there is a laundry place right on the corner of the street, near the mini supermarket.
The location is also very good. About 5 mins walk to the metro station Campo 24 Agosto and 15 mins to the train station São Bento (and about the same distance to Porto Campahã). We recommend doing everything by foot, since everything is really close once you get to the historic center (religious monuments, Ribeira, Nova Gaia - where all the big Port wine makers are - , Majestic Café, Lello Bookstore, etc.)
We had an excellent week at Fernanda's apt, we couldn't ask for more! We certainly recommend :)