Seriously, I can't find any flaws to complain about!
Dining at Petrus is an experience not to miss. The food is delicious, and without a doubt I would eat anything that comes out of that kitchen. Service is genuinely the best I've ever experienced; every staff member seems to genuinely enjoy his/her job and wants to please you. The atmosphere is beautiful and intimate. Even though this isn't an inexpensive restaurant, I do think it is a wonderful value for the quality of food and service you receive. For 2 adults, it was almost $400 including additional tip (12.5% was included but we left more in cash), and we did not order any alcohol.
Tip: book in advance if you're particular about what time you dine. We booked a week in advance for a Saturday night, and the only reservation left was at 22:00. Not a problem for us, but I can imagine not everyone wants such a late dinner.
Petrus has exceeded all of my expectations, and I think I'll be returning on a weekly basis because I doubt any other restaurant will be able to live up to Petrus!
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