Rada has a nice flat on the 4th floor of her building, and don't worry, there are elevators for sure. I did not have a key but she was home the whole time, but I was a bit worried about going out and getting back later in case she was asleep. Also, I do not speak any French so communication was a bit difficult but at the end of the day it was a nice and very clean room and bathroom, Rada was very nice, and she called me a taxi to go the next morning. I do not recommend staying here if you do not speak French, because it is a bit hard to find the nearest place to get food etc. Really good value and comfortable place in central Lausanne.