The location is good, downtown Porto (notice you need to climb the city each time you go out somewhere, and of course, no parking).
The apartment itself is great for a couple. It's cool, and clean.
The communication with TPC was good also.
It's listed as about 60 euros per night, but with all the taxes and extras (cleaning and service fee) it would cost you about 40 euros more, so not sure it's worth the total value.