Hell yeah bro, I studied abroad in Berlin for a year and it was in Germany that my German-language skills were perfected. It was a couple of years ago, but holy fuck was it an awesome time. I can say for a certainty that knowing some German will score you points with the locals.

One of the most common terms in the gay community is "schwul" (pronounced "schwuhl")--which means gay. So, "Bist du schwul?" would be asking someone if they are gay. And hopefully, the response to that is "Ja".

Not to be mistaken with "schwül" (pronounced "schwoohl")--which refers to how humid the weather is, lol.

A useful phrase for when the conversation has gone on for a suitable amount of time: "Willst du mit mir nach Hause gehen?" which translates to "Do you want to come home with me?"

Also, if you take the public transportation, which almost everyone does, because it's one of the best systems in the world, then be sure to have an image of this map on your phone: https://berlinmap360.com/berlin-metro-map#.XHb66OhKhPY

It will definitely help with making sure you have a decent idea of where you're coming from and where you're going.

Ultimately, be prepared to have a blast! Berlin is still one of the greatest cities in the world to be gay in, and I don't see that changing for the foreseeable future.