My wife and I just finished a 15 day tour of Portugal and we really had a great time. Our favourite apartment and city of the whole trip was Porto. Gundega and Antonio's place is so cozy, comfortable, and relaxing. It felt like our own little apartment in glorious Porto. Porto, wow, one of my new favourite cities. Gundega has lots of great suggestions for things to do see and eat. Trust her judgement, she led us to some really amazing places, especially the grilled meats at Restaurante Americana just around the corner from their place.
Go to Porto and stay at Gundega's, you'll be so happy that you did.
Also, a day trip to Guimaraes is well worth the very inexpensive 3 euro price.
Enjoy,
david