Wow! We loved staying in Sara's apartment. The apartment is quite big and the decoration and furniture is lovely. It has everything you need to make a simple meal if you decide to stay in. We loved having a nice beer or a glass of wine on the terrace. We had been running around for 2 weeks so it was nice to have the option to settle down to eat at "home" instead of eating out.
The apartment isn't right in the center of tourist sights, but it is close enough to walk there (downhill) and take the bus or metro back since it's mostly uphill. You can get to Lapa metro station in 10 minutes. You can easily get an Andante Tour card if you're a tourist so that you don't have to bother with respecting all the zones.
Sara was very nice. She showed us how everything worked (garage, bikes, etc.) and showed us a booked filled with recommendations. She speaks Portuguese, English, French and German.
We had a lovely time in Porto and we really felt at home it Sara's apartment. Obrigada!