Aire de Sao Romao do Coronado

It's a struggle to find a level spot, restrooms, and two outdoor showers. There are also permanent residents and some old caravans there! It was still manageable for a night's sleep.

Pros: train within walking distance (ticket machine on platform), cheap and great grey/toilet dump. Cons: location muddy, electrical connection very unreliable and atmosphere somewhat dodgy. Some campers seem to be inhabited for a very long time. All in all, effective for a visit to Porto, but certainly no more than that.

It is accessible for large motorhomes, but the access is a disaster. The site is slightly sloping and not very clean. Hardly any opportunities to walk the dog. Possibly possible for Porto, but not for us.