The location is superb and the apartment is beautiful and very clean. Unfortunately, our code didn't work when we showed up to check-in, and it took a little while to get in touch with someone to get a new code, but once we did and were in, everything was great.
It was beautifully appointed with modern furnishings, etc. Everything we would need for our 2-night stay, plus delicious espresso for the mornings. Great little balcony overlooking the busy street. We were quite literally within walking distance of great restaurants, shops, bars. There were so many options around the apartment. Our favorite restaurant was one owned and run by a mom and her daughter, called Taparikas. Go there!
My one tiny little complaint is that there is really no place to put your luggage. The apartment is small, which wasn't an issue, as we really were only there to sleep, but our luggage was just placed on the ground, and we had to use every available surface if we needed to repack, etc. Plus, there is no way to carry your bag up the ladder to the bed in the loft area. I thought this was a smart use of space and didn't mind climbing the ladder a few times.
Overall, we had an enjoyable stay and wouldn't hesitate to stay again in the future if we return to Porto.