Amrhein's...open or closed?
As far as I know, they are still open. You may have been reading an old post--the old Amrhein's had shut down for several months, and no one was sure they were going to re-open. They did re-open last year, as a more upscale restaurant.
Personally, I like the old Amrhein's better, but the new one isn't bad.
I don't think either the new or old Amrhein's is worth trying. It's just bad. The same people own Mul's Diner across the street where I have been served overdone bagel and underdone burger and pancake. The old Mul's was cafeteria style food served by sullen waitstaff. The new is overpriced and still has that mass-produced taste but perhaps has moved into Holiday Inn style from cafeteria quality.
Just avoid it.
There are places in the Leather District, Chinatown, etc. If you want a nice pub-style place, go to Jacob Wirth's in Chinatown. The food is good and the atmosphere authentic.