My two daughters and I stayed three nights in Margarita's guest house, and had a great time there. Her place is clean, cosy and safe, in a neighborhood which isn't safe in all places. We never had that feeling where she lives though.
During the day we always took the metro, and never had a problem. When we came home late in the night, we took a Lyft and everything went very smooth and easy.
Margarita herself is a very warm and friendly woman who cares a lot about her guests, answers very quick to messages and she even offered to bring us to the airport. I'm so glad we said yes, because it was so interesting to hear her tell more about the neighborhood and her life.