We had a lovely stay in Rome at Marina's flat. It is in an excellent location, just a minute or two walk away from San Pietro Station, yet a quiet and residential area. The flat was small and cozy, but just enough space for 2-3 people for a couple days. It had everything we needed, including extra sheets and towels, kitchen supplies, and an adorable outdoor courtyard area.
Though we never got to meet, Marina was extremely helpful throughout our stay, giving extended directions and info before our arrival, and connecting with us via Whatsapp to communicate additional information during our visit.
I highly recommend staying here if you visit Rome - you can't beat the location for access to the Vatican and public transportation, and Marina was a wonderful host!