Relais sul Lago hotel near Vereze is a nice and clean 3-star hotel especially popular for the spa facilities. You can find here a Hamam (Turkish bath) in the recreation center and a view on the lake. specially I liked the food in the restaurant.
The Albergo Ottocento hotel is very special to me because this is where I proposed to my wife (I popped the question near the Trevi fountain). It is a 4-star hotel located at the heart of Eternal City in between Via Veneto and Via Sistina.