Even if information is given to you, in writing, by staff of your venue, make sure that you talk through the whole lot again in person before committing it to print yourself.
Make sure that the chef knows that the set menu will be circulated to guests and printed on menus, so it must be adhered to.
If something is important to you, such as the shape of the tables, make sure hat you ask to talk about it with the maitre d' as well as the event coordinator, especially if they are new.
Sleep in the room, or at least try out the bed, before you stay somewhere on an important night when sleep is going to be elusive anyway. The miserably uncomfortable bed was so soft that I couldn't sleep on it - I had to lie down the join in the middle (it was made up of two twin beds pushed together).
If the plumbing doesn't work (the flush in my room didn't work, so we all had to walk all the way down the hall to go to the loo), stand firm on demanding a reduction in charge for the room, even if the receptionist claims that it works - no one else was able to get it to flush.
Even if you think you already did all of these things (we certainly thought we had been clear about our requirements), expect things to go wrong, and plan accordingly.
That being said, yes, we had some issues with communication, and with the rooms themselves, but overall, I still recommend the venue for weddings - especially as the chef role has now been given to a personal acquaintance, and we know he's good.