In general the apartment is okay, the room is good (for 3 people I think it would be small), the kitchen is new and has a coffee maker, a kettle and a microwave. The living room has a good couch and a TV. The bathroom is small, the shower box is really small and it was difficult to move inside of it. I don't think this is a home for tall people (I'm 1,72m and my boyfriend 1,82m).
The location is awesome, very close to São Bento metro station, Luis Bridge and the others turistic attractions in Porto. The building and the apartment are old and I don't think the apartment has anything related to energy efficiency, I was relieved that the host provided a heater because it was really cold inside. The house has a fan too!!
Our communication with the host was awesome, and he/she helped us with everything we needed. Even provided directions on how to get there from the airport.
I wouldn't recommend this apartment for long stays, because it was a little bit loud at night (people screaming, cars with loud songs passing by,...) also the internal windows in the room didn't close so it was a little bit uncomfortable. For tourists is a great place and almost in front of it there is a shop where you can buy good breakfast (orange juice, pastel de nata and tosta mista) for 5 euros.