Monica's little apartment is the perfect size for two. I had a fantastic stay for Easter week. She is such a friendly host, very flexible. The room is very clean and stocked with everything you could need for breakfast. Espresso, cookies, bread, milk, juice. There are pots and pans to cook too. It is a quiet neighborhood. The WiFi works great and the AC cools off the room so fast.
You are a 4min walk away from Trastevere train station. As everyone comments, porta portese is right outside! It costs 1euro to catch a train to Roma San Pietro for Vatican City. Monica even has maps and little tips on how to get around the city depending on what you want to see. She held our luggage for us after we checked out so we could have a little bit of extra time in the city before departing. I would absolutely stay with her again.