This apartment was lovely and well worth a visit!
The apartment is situated half way between Porto town and Foz, close to the Ponte De Arrabida bridge. It is a short walk down the hill (doesn't feel so short on the way back up!) to the banks of the Douro and a convenient little supermarket. Once on the river you can chose to walk into town (25-30 minutes), passing many beautiful sites, cafe's and bars along the way, or get the tram/bus for €3.50/€2 euro's respectively. We normally chose to walk (the uphill to the apartment really isn't that bad!)
The apartment itself if very clean and modern with all the essentials you will need including air con, walk-in shower and a lovely little coffee machine for the mornings. The balcony is an early evening sun trap and the views are beautiful. There was even a washing machine, tumble dryer and iron in the small complex, which residents could use if needed.
Marco himself was polite, helpful and great at communicating. He was happy to be called if needed and sorted any issues very quickly so that we could continue enjoying the break (our key cards stopped working - it was sorted within an hour!). I would highly recommend staying here as a great base to explore the wonderful city of Porto.