I talked to Brynjolf, or whatever he's called and he will only let me do this thieves guild mission. If I go to the rat ways on my own will I find Esbern?

Yep. He'll only give you info about Esbern after you complete his mission.

How do I get to the Ratways? And cheers

Bump.

Anybody know how to enter the Ratways?

You can get in at the lower parts of the city, there are doors near the water. Where you see a little rusty gate, that's it, but you will have to fight yourself to the Ragged Flagon.

Ah, got it. Thanks