Federico is a great host and it was really easy to communicate with him even we couldn't met with Federico personally, however his friends was really helpful and explained us everything about the flat and city.
The flat has a great location, right in the heart of the Trastevere that was in good walking distance to all of the areas and also Trastevere is a cool area which has great cafes and restaurants.
Flat was comfortable: big terrace with sunbeds and lovely rooftop views, a brand new bathroom, bedroom with big wardrobe and enough hangers.
Just to be aware, need to walk few steps over the stairs for reaching the flat but it wasn’t problem for us. I would absolutely recommend a stay in Federico's apartment for anyone planning to go to Rome.