Susana is lovely, and will help you. The beach is about 15 minutes walk. The metro (to go to Porto) is much farther, plan 30 minutes walk, as buses are very sporadic and don't run after 18:30. Everything was great except that I personally found the flat to be cold and I had at first one thin blanket for the bed, so I asked for more and got another one but still it is not like having a duvet and heating in the flat.