Carla's apartment is the best-ever apartment I've stayed from airbnb in the past years. It's truly in the very center of the old town of Porto, with the view of São Bento train station from the bedroom's balcony 200 meters away. Almost every sightseeing place is walkable - taking a stroll in Porto is very pleasant, no matter what the weather is. Carla is very responsive and helpful - she provides very detailed travel info for guests with maps, restaurants and bars recommendation and sights nearby. The apartment itself is quite modern and in simplicity style which is just where my taste falls. It has three sides of windows, which means you can have an almost panoramic view. Put all in a nutshell, the four-day stay at Carla's apt is simply perfect.