Having traveled to Ethiopia and Washington DC (where they have some of the best Ethiopian food in the US), I found Abyssinia to be good but not outstanding. Perhaps they were having a bad night. But it was a Friday night if remember correctly, soooo....
The best part to me was the "coffee ceremony". Its one of those things that you have to know about and ask for to get. Coffee ceremony is where the coffee beans are roasted over coals and fresh roasted in an authentic black coffee kettle. Its a long process....perhaps 30 min (thus the reference to "ceremony") But its well worth the wait and done at your table, so quite entertaining. The coffee is so smooth and so strong it will make Starbucks seem like Folgers.
Enjoy!