And if you have platinum status, it will be complimentary.
We just stayed there. When we checked in, they said free continental for 2. But actually we had full breakfasts (for all 4 of us) and were never charged.

The area around the Westin is pricey. Even the bakeries are not that great. There was one that turned out great near the hotel. But the others were awful. Will try and figure out the name of the good place.
We did find a couple good places for that first night. La Scala is just around the corner and is decent.
Down the street (down the hill) is a place that has a brick oven for pizza but has other good food as well.

It is sad that in a great food place like Rome, it seems that a majority of places are now there to separate the tourists from their money while serving below average food. I remember fondly the days of just wandering around Rome off the beaten path and finding gems. Seems those are harder to find and further afield.

I think you can't go wrong with Perche's recommendations. We liked Constanza's.