The location of that restaurant makes it a bit difficult to know if you're not specifically looking for a steakhouse in Berlin, but it's definitely worth the trip to Frankfurter Allee (S+U Bahnhof, then 10 minutes walk). There is a wide range of meats served grilled, while still in the pans. I have eaten there a couple of times, and every time tried something different and very tasty. The waiters are very friendly and caring. I would definitely recommend it.
If you own or manage Steakhaus Rio Negro, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.