Great location, obovr the D metrolime witch can take you to the center and to a very big metro station with line to the airport. Or even a big train station with lines outside of Porto and even with the D you can cross the famous bridge and the buitiful view of Porto.
The apartment is big.
On the downside massages communications with Antonio is not that good but he can give you his phone number and if you have local calls service then he is answering when you call.
Another downside is the the apartment could be a bit more clean. And you can hear a lot of noise from the neighbours.
Other than that all is good.