The indoor moated enclosures are good relative to many big cat indoor enclosures in Europe, but as I hope LD will confirm, on the day of our visit the Lion's indoor enclosure was their only enclosure, as the medium sized outdoor moated enclosure (which are good) on that side had tigers (Malayan?) in it. And although on the other side both the indoor and outdoors had tigers, I've got a nasty suspicion they were different groups.
The splitting of the ABH's outdoor and indoor exhibits makes bad enclosures worse and good ones bad.
Having said all of that, zoos over this end of the world have really given me a different scale for judging exhibits, I suspect I will be a lot kinder the next time I am in Berlin!
I've just had a look through my pictures and the order is a bit confusing, but I think there were Siberian Tigers in the outdoor enclosure on the lion side. The indoor enclosure was signed for lions, however I didn't actually see them, so I'm not sure where they were (I visited the ABH towards the beginning of my visit to the zoo, and due to only having one day to visit, couldn't go back for a second look at the end).