Carlos' place really is as great as it looks and Carlos himself is a lovely guy, very communicative and on hand to help if you need him. He let us check in early when our flight was moved which was a great help.
The apartment is wonderful, loads of smart touches with the spa, steam room and cinema screen but the view makes is what makes it. Nothing better than a coffee and pasteis on the terrace!
You are about 9 miles from Lisbon centre so 20 mins on the train or 15 if you only go to Belem. Station is 10 mins walk from the apartment. The beach is 5 mins walk away and you can walk round to other beaches along the coast path or if you want to go further, get the train up the coast.
Don't overlook Paço de Arcos itself either, there are some love places to eat. O Pastus is a cracker. Super apartment and owner, highly recommended!