I wish I had done more research before I bought tickets. The vast majority of the species here do not have enough space and enrichment in their enclosures, where you can see a lot of the animals are exhibiting behaviours reflected by this. The large cats were seen pacing up and down in front of the glass, even the small sand cats were pacing too. The security at this place is lacking. Visitors were seen using flash photography, banging on the windows and even children were running laps in the cat and monkey buildings - there was not a soul to be seen to remove these people for not respecting the rules. The only creatures which I can say had appropriate space were the ants, and that's only because they had a large tunnel system around the roof of the aquarium building! Accessibility around the place was lacking. I know most of Berlin has cobblestone streets but it is a nightmare for people who have wheelchairs, pushchairs and walking aids. It would be better to have a smooth path alongside the cobblestones so people with access needs can use them. Toilets and benches were few and far between too. I didn't see any water fountains around the zoo, so make sure to bring plenty of refreshments. There were a lot of litter bins so the visitor areas are relatively clean. We bought tickets on the day and it came to around €80 for two adults (zoo and aquarium access), I believe it would be much cheaper booking in advance online. We also asked the reception (it was called the service desk or station?) if there was a cloakroom or some lockers to put bags and coats and they said no, only to reach the aquarium at the end of the visit and find out they did actually have a cloakroom. At the time of visiting in November, all of the cafes and drinks kiosks were closed and I believe there may have been two restaurants open, although I only got lunch at the Italian(?) restaurant. The pizza was okay, but concession prices are to be expected.