We loved this apartment. It is slightly further from the touristy areas (10min leisurely walk), e.g. the Ribiera, but it turned out to be a blessing as we were in Porto over a long weekend and the students were quite noisy in the main areas. We managed to find Xana's apartment much quieter.
The apartment has relatively large rooms and is quite charming with classic wooden floors that give it a homely touch. Yet the apartment is stylish. We were only 3 people, so there was ample space, but you can easily accommodate more people.
The vouchers for the bakeries just below the apartments were a wonderful touch, as others have mentioned.
Xana was friendly and very helpful and I think this apartment offers great value for money.