I've been to Berlin 4-5 times in the last couple of years. Always have. a great time.
I agree with the comments on the hustler bars, basically a waste of time for me. I think I played with one of the guys in the bathroom at Blue Boy, but it's just not worth the effort.
Lab on Thursday nights is a lot of fun every time I've been.
I've also found a number of really good escorts, although they are top guys in town and charge rates more in line with the rest of Europe, so it's not a money saver, but I've had some really good times.
Can't say enough good things around these two in particular:
https://www.planetromeo.com/#/hunq/ATHLETIC-TOP
https://www.planetromeo.com/#/hunq/Vadim_Romanov_XXL