The apartment looks great in the pictures - it's even better in real life!
This is a beautiful apartment in an absolutely excellent location, a short walk down to the waterfront, a quick walk up to the stores and shopping streets. Inside, it is tastefully decorated, spotlessly clean, and includes everything you could want. The many window allowing breezes in when it's cool outside, or there were three (!) air conditioning units for when it was hot, one for each area. And the spectacular windows and balcony maybe create the best people-watching spot ever. Our adult son, who is apartment hunting right now in a different country, immediately opened the corner window, put the chair in front of it, and declared he could move in tomorrow.
The host was efficient and gracious. Porto is a busy city with people and traffic, and the occasional boisterous pedestrians late at night, so noise is to be expected and part of the vibe. The one thing no host can do is magic away the subway construction, though they did their best with the thoughtfully supplied earplugs which were appreciated. I did notice the reference to construction before we booked, and we certainly still enjoyed our time, but I didn't really appreciate what a big project this is. I think during weekdays the construction continues right through the night, though it did seem to stop at night on a holiday weekend. The workers are good about trying to keep the noise down, there's just a limit to what they can do when there's big machinery backing. If you are prepared and not overly sensitive to noise you would be fine.
And of course once the new Rose line is done, not only will the construction noise be gone, but the apartment will be even better located for additional transportation.
But all in all just an outstanding apartment, the nicest Airbnb we've ever stayed in. Highly recommended!