Hey, I've also seen a rat near a subway in Borovo - it was right next to the tram station. I was standing there waiting for the tram to come. You know, when I told my sis I'd seen a rat she got closer to the place I'd told her I'd spotted it and began searching for it... haha... I guess that explains why we do feed stray dogs sometimes... we're definitely animal persons :)))
By the way, I am one of your students from Sofia University. I've been following your blog and it's very interesting to me to read about your adventures in Sofia... :D
Keep blogging!