Me and a friend had a great stay in Step In. the location was great - not right in the centre but in a fun little area with nice local cafes, shops and bars. The flat was very attractive, spacious, clean and airy, with comfy beds, a good shower and kitchen facilities (though we didn't use them). The building is owned by Step In, more like a hotel than an individual flat, so it was a bit noisy one of the nights with guests leaving for the airport (nothing earplugs wouldn't fix!) Perfect if you're looking for a nice location to relax after a long day of wandering around Porto.