We stayed here during a recent long weekend in Porto. The apartment is compact, but stylish, and has everything you need for your stay (including many thoughtful touches like shampoo, hairdryer, coffee machine). Unfortunately we didn't get to meet Claudia, as our flight was delayed and we ended up arriving at 2am(!) - however she was absolutely brilliant at keeping in contact and providing us with new check-in instructions. The tips she gave us for eating out were also much appreciated!
The location of the apartment (situated in a small square right in the middle of the historical district) simply cannot be bettered - you are minutes away from the riverfront, the Rua de Flores (many good restaurants here) and all the important sights. Most places are walkable. One small issue: it can get quite noisy and you will be able to hear everything that is going on outside when in bed. It didn't bother us, but earplugs might be advisable if you are a light sleeper.
We are already planning to come back to Porto and when we do I would definitely book this apartment again. Thank you Claudia for your hospitality and helping to make this a great trip!