Looking for a studio to rent or room in an apartment

I'm looking for a studio of flat with 1 room with good conditions to live in for a period of 5 months.. Eventually a room in a shared flat  (with kitchen ) with other students or interns, not far from  the city center, in a  secure and peaceful place. Could also be in a students residence.  I  have  been in London studying, in Hamburg as a Comenius assistant, i  am doing a master in Flensburg University and have been au pair in a german family; have done an internship in Credit Suisse and i am  going to Brussels to do an internship in EU Comission. I speak  portuguese, english fluently, german  fluently, spanish and  french (will improve french certainly in Brussels  :)).