The flat is perfect for travelers who want to experience Rome to its full extent. All great spots are generally within walking distance and even some nice unexpected places to be discovered on the way there (I personally like to visit a city by foot - my sisters complained after the second day of more than 15km walking, but still they loved what we saw... :-D).
For travelers who do not mind a little noise outside in the evening or early in the morning (due to the different restaurants and market activities on the square), the flat is the perfect starting point for all geographic directions and any kind of activity. I would recommend it and will come back again!