As long as you speak English, you should not have too much difficulty communicating in Berlin. Most people speak English well.
I'm in Berlin right now. I went to last Thursday's Naked Night at the lab. It was a blast. I thought the entrance was a little ambiguous to find. It is at the back side of the building, on the left side, right next to a fenced-off little field. There is graffiti on the walls on the side you enter-- a lot of graffiti.
I was number 2 in line to enter, and I arrived right at 8. I was getting nervous because there was no crowd at first, and I was wondering if I was really at the right place. Around 8:30, it filled up quickly. Once inside, it was the closest thing to heaven on earth I've ever experienced.
I've been to bath houses around the world, and nothing matches the Lab. It is an incredibly liberated experience! There were men of all age groups, body types-- but best of all, the atmosphere was pure lust. Sucking and mostly fucking everywhere. I discerned no judgement or arrogance, except a little from the doors people.
I went the following Friday as well. The line was crazy long, and filled up well over an hour before open. Be advised: people are not exaggerating here when they say if you go for the 2-1 on Friday, arrive AT LEAST an hour before open. I got there again an hour in advance. I was in line right up until midnight, 3 hours later.
One frustrating thing about the Friday night experience is that there was no order being maintained with the line. There were a large number of people just cutting the line-- in groups. They were just bypassing the line which went for blocks and just walking to the front where they gathered in mass. Nobody stopped them.
Between Thursday's Naked Night and the 2-4-1 on Friday, I actually had more fun on Thursday. There were plenty of men, but without being so crowded that it made it difficult at times to navigate. Friday had many many hot younger guys who were spending a lot of time raving on the dance floors. I love fucking daddy's, and there were plenty to be had on Thursday without the long line.
Also, I'm not sure how the 2-4-1 works. That night I got only one beer, but when I went to check out I was charged for a gin and tonic (which i did not ever order) which was twice the price. Not that I cared. I still got a lot of bang for my buck lol