A group of us went to celebrate a significant birthday, needing somewhere to sleep 5. This apartment suited us perfectly. Decorated in modern style, this had all the comforts you'd need (dishwasher, microwave, internet access, tv etc), but best of all a large balcony (with seating) with a view to die for across to the old town. There was a handy supermarket 10 minutes away along from the metro stop, and even better a cake shop selling natas.
A good range of restaurants were down the hill on the river front (a bit of a climb back up, so you need to be reasonably fit). Lovely to eat on the Vila Nova de Gaia side because you get such a fantastic view across the river.
Access from the airport was good - one change of line taking you to Jardim do Morro, a 3 minute walk to the apartment.
Service was efficient; we had to phone at least 30 minutes before arrival (in practice, from the airport), and were met by the very friendly company rep to hand over the keys and show us round the apartment. There was a nice welcoming gift of wine & fruit. The company was also flexible enough to let us check out a couple of hours late as nobody was coming in that day.
Recommend this 100%.