My friend and I had a wonderful stay at Ana's apartment. It was a great location and we loved the local cafe and food store just underneath the apartment.
It felt roomy inside with great light because of all the windows. My friend stayed on the sofa bed which she said was really comfy.
It is the middle of the city so of course expect city sounds, but I would highly recommend this apartment and Porto, which has very quickly become my favourite city, the people are so nice and the sights are wonderful.