Nicoletta's appartment is very nice, decorated with good taste, and very well located in the Navigli area. The little balcony was very pleasant to enjoy the view in the Navigli canal. The second bathroom was a real plus for 5 girls !
We didn't meat Nicoletta but she arranged everything very nicely (keys, breakfast, advice for restaurants, etc.).
The only thing I could recommend is to book it for 5 people maximum (we originally booked it for 6, and fortunately we were only 5, because the sofa is quite small and it wouldn't have been confortable for two).