First the "I learnt" should be "I Learned" and the second sentence should be re-written to say (I'm Italian and I practice English so I don't lose it.), and the last sentence should have the word 'of' between "is interest". The whole paragraph would read.
"I learned English in Dublin, where I lived for 1 year. I'm Italian and I practice English so I don't lose it. If anyone is of interest!"
I'm definitely not an expert on grammar or a teacher at that but that should help you out a little. Also it would be of interest to take note of the punctuation which I think should be abolished to just periods, question mark, and exclamation point.