I will be traveling after I graduate in June and I would like to spend a few months backpacking around Europe. What would be the best city for backpacking. First the city has to be safe, safe enough for a female to walk around by herself day and night. It also should have good public transit since I cannot afford a car. I would also like a city with many historical sites as well as a good walking city with many places to walk to. What cities are the best for backpacking that fit my description?