We have rented the appartment with a group of 8 men for a city trip to Portugal.
The communication with the renters was really good and quick which make it easy to communicate if there are any delays on your flight or any other problems.
The location of the appartment was very good you can walk almost anywhere within 5-15 minutes.
Lastly the house was clean and all neccecary facilities where their ( the dishwasher was especially a nice suprise)
We had a great stay and would recommend it to anyone who would go with a group to Porto.