I have stayed at Villa Sassa for a number of times already while on business in Lugano. The rooms I stayed in are pretty spacious and pretty quiet, however, if you get a room that faces the street and not the hotel grounds you may get distracted by noise.
The beds are comfortable, the gym, pool, and other fitness facilities are amazing.
The breakfast is simply very-very good, and the views from the dining room are breathtaking.
And if you need to get to Lugano downtown - it's just 10 minutes walk through the lower parking lot of the hotel.
The noise and a bit outdated bathrooms are the main reasons why I did not give it five stars.