Lorenzo was an excellent host. His responses were prompt, and his knowledge of the Trastevere area was very helpful.
Additionally, there is a tourist information office less than a block from Lorenzo's on the main street. If it is your first time in Rome, they are very helpful.
Lastly, if you are using public transportation to get to Lorenzo's, there is a bus stop less than a block away. At the time we were there, it was bus H from Termini, and it was the first stop after the river. It lets you off right by the information office I mentioned.