Well .... its all a bit hit and miss, but IF Barcelona is the same cost of living as the UK ........ I was living comfoprtably in the UK for 6 months on £1250 a month (equiv of €19,800 a year) with no mortgage or rent. So depending on what life style you want to achieve that would roughly leave you €933 a month for rent ...... Sorry its such a strange way of comparing but its all I can offer you.