This comfortable apartment is right in the thick of the action on Carlos Alberto square, which is mainly a good think in that it's a central location to see the main sights of Porto. But both bedrooms overlook the square and during our stay it got very loud very late into the night, with the last drunk bar patrons often not quieting down until 5 or 6 in the morning.
Aside from that, it's a pretty great place with only a few minor drawbacks. Getting in and out of the apartment is a slightly complicated process involving two codes punched into different keypads and a bunch of steps, but once you're in it's a nice roomy two-bedroom. The kitchen was a bit tricky (we never did find a switch that would turn on the kitchen lights), but it has all the basic necessities.