Looking for accommodation in Thessaloniki from February to July! no pets, no smoker

My names is Laura, Im from Colombia but I ve been living in different countries for my studies and jobs, like France, England, USA and now Im doing a Master in Human Rights in Venice, Italy. but as part of the program we have to do an exchange with other universities in Europe. I chose Thessaloniki for the amazing culture and history. I would like to find a place only for my own, but Im not completely close to share! Grazie :)