As others have said, the house is much bigger than expected. We were 10 adults and a 2 year old; three generations coming together from Australia and the UK for a week. We had a great time. There was ample space to be together and also to have privacy. When you first step inside the house you can't help but be wowed by the view of the open centre of the house and the river beyond through the vast window. The terrace is huge, curving around the house and looks out over the river and the pool. The house is high up so there are many steps down to the lovely pool area. It was not an easy house to be in with a 2 year old (nor would it be for anyone with mobility problems), but feeling as if we were on the set of a Bond movie easily compensated. Our contact was with Diogo from whom we learnt about how his grandfather built this magnificent house and beautiful garden. It was clearly a labour of love. Diogo was warmly hospitable and so helpful with informative, prompt responses to all our questions. Mira, the caretaker was very lovely despite us not having a common language.
The nearest supermarket is in Melres, a 5 minute drive away (too far to walk with heavy shopping). Buses go regularly into Porto. Taxi to Porto was about 45 euros and took about 30 minutes. The nearest cafe is within view, on the waterfront and can be reached by walking down through the garden.