I dined at Trattoria Nervosa on a Friday evening and luckily grabbed a table without waiting. They do have queues and do not take reservations, so be ready to wait for a table.
To my disappointment, they did not turn on air conditioning on such a hot summer day and the upper level was hot and uncomfortable. This dining experience would have been significantly better should there have been air conditioning.
I ordered the beef tenderloin carpaccio which tasted cooked and dry. The rigatoni pasta is cooked on the al dente side, the sauce has a bit of acidity and there is a generous portion of veal and beef. Their Mafalde Ai Funghi pasta with truffle pasta was fragrant and creamy, and I would recommend this one.