These are the less explored corners of Stockholm, Amsterdam, Berlin and Porto that you’ve ‘stumbled into and ended up staying’ • Tell us about a great trip in the UK – the best tip wins a £200 holiday voucher These are the less explored corners of Stockholm, Amsterdam, Berlin and Porto that you’ve ‘stumbled into and ended up staying’ Tell us about a great trip in the UK – the best tip wins a £200 holiday voucher Guardian Travel readers' tips Every week we ask our readers for recommendations