Don't let the plethora of repetitive photos here mislead you (as of writing this review this ad has 47 photos for a 4 bedroom apartment).
The unit is not as "spacious" in person as it appears to be. This "entire rental unit" is basically a collection of bedrooms and walls. This permits greater guest capacity and hence allows to cash out more money in exchange for poor guest comfort. I don't know of any "apartment" that doesn't have a living room space unless it's student housing or something.
That makes the unit unsuitable for big families that want to for e.g. have breakfast together in the apartment or spend an evening together after traveling all day. It's not as "ideal" as advertised. It's beds and walls. If you are indeed looking for a place just to sleep, might as well book a hostel or hotel room for a cheaper price with better service.
The only room in this entire unit that doesn't have a bed and appears in the pictures to be a place for socializing is actually a 5 square meter entrance hallway with a small couch and a non-functioning television hanging over the unit entrance. If you're thinking about the terrasse as an alternative, think again. There's no privacy like in a living room and it's always weather-dependant - unlike a living room.
The unit has no internet - instead we were provided with a hotspot device to be used by all 7 of us.
Communication with the host is very poor relative to our experience with other hosts from Airbnb. Particularly after we decided to cancel our reservation. We tried to communicate with the host to reach any type of understanding or agreement but received the cold shoulder and we were completely ignored since the host cashed out already on all 6 nights. In the past ca. 8 years of using Airbnb, this was by far our first horrible and sketchy experience.
This accommodation strays away from the core principals of the Airbnb concept of renting entire apartments to live in.
There are better places to stay in Porto. Don't waste your money here.