Obviously I'm a little biased as I love cats but had a great experience at Cafe Neko! We went on a Monday and it was very quiet and relaxed. The cats were obviously well looked after and were relaxed and happy to be petted with lots of space for them to run around (they were not allowed in the kitchen and stuck to this rule the whole time we were there, at least). Decent coffee which was cutely presented, didn't order food so can't comment on that. No pressure to leave in a rush, it felt like you could stay all day if you wanted to and I definitely could have done! Staff were polite and the whole atmosphere was very relaxing. Definitely recommend if you're in Vienna!