This place had only been open a week when we tried it, a city-centre follow-up to the suburban original. At the back of the restaurant is a clearly popular indoor climbing centre, so don't be surprised if you find people wandering through or around the restaurant in various states of sweatiness, just-out-of-the-showerness and/or undress.
The menu is [currently] only available in French, but our waiter was both willing and able to switch to very good English. The other staff members we interacted with had levels of English ranging from serviceable to could-lead-to-misunderstandings, but overall service was friendly, attentive and eager to please - which is as it should be, given how new the place is.
Being new did show at times, however, with a couple of mix-ups at our table and others', although nothing terribly serious and again always offset by a willingness to get things right. Bear in mind though that you pay at the bar - which may well be standard here. We asked for the bill and thought the waiter was going to bring it to us, but waited ages and got nothing, and when I asked again he explained that I should go up to the bar. (He claimed he'd told us that when I first asked; he hadn't, but let's put that down to a simple miscommunication.) There was then confusion with the bill as well, almost certainly again due to them having only just opened, but it too was sorted out with a smile.
On the plus side, our meal was great. We both ordered the beef burger, the locally sourced meat for which was beautifully seasoned and well cooked. The sweet, marinated red onion was a nice addition, too, and the sesame-seed bun held everything together well. The burger was served with the best French fries I've had in years - neither too salty nor too oily, and with a good flavour - and a simple rocket salad. I enjoyed a glass of dry white with my meal, the bottle for which the waiter presented to me, opened and gave me to taste rather than just pouring straight up. In total, the two burgers, the wine and a water came to €36.
Overall: good food, enthusiastic service and an interesting setting. Once they really get into the swing of things I'm sure the place will rightfully do very well for itself.