DC away for a week in June so for the first time ever DH and I have the opportunity to get away sans enfants for a few nights.
We've had a tough time of late so would like to mainly sit in the sun, drink wine and people watch. 
We'd ideally like to go somewhere we've not been before. Considering Dubrovnik or Porto but any other ideas or recommendations welcomed.
Wherever we go, we want to be central so can walk around easily. Not averse to a nice apartment or hotel.
Not Paris, Amsterdam, Madrid, Barcelona, Valencia, Lisbon, Prague, Rome, Venice, Verona, Palma, Lille, Copenhagen, Stockholm, Helsinki, Riga or Tallinn as have been there before.
Ideally near the sea but that's not crucial.
Any recommendations appreciated.