To start with, this isn't a normal hotel with a front desk, it's a set of beautiful apartments in a great part of Porto. Everything about our stay was top notch from the moment we booked it. Miguel, the manager (or owner? I'm not sure), e-mailed me within minutes of our booking on Orbitz to arrange the details of our arrival. If you don't speak Portuguese and you're worried about language barriers, don't be - his English is every bit as good as a native speaker. He was incredibly flexible about what time we could check in, and when we arrived he met us at the front door to give us the keys, show us around the apartment, and give us a complementary bottle of port wine. He was more than happy to answer any questions we had about the apartment/city/country/etc., and was incredibly responsive when we texted/emailed him a couple questions that popped up during our stay.
The apartment itself was beautiful - the exterior of the building looks a bit worn (the buildings in the area are largely quite old), but the interior was spacious, new, and well furnished, had great wifi, and contained a washer/dryer which came in very handy. It was decorated with art by a local artist, which added a truly unique touch.
Overall the entire experience was fantastic, and we would definitely book again if we go back to Porto (which I fully plan to).