Missing paperwork is one of the top reasons for delays during the mortgage process. I suggest following the two-by-two system: two most recent pay stubs, tax returns, W-2s from your employer, and bank statements from all of your savings and checking accounts. Be sure to remain clear and transparent, provide evidence of all forms of income.
I don't care about style, but I am a total clean freak, so a messy home is a deal breaker. I had one girlfriend who never wanted to go back to her place. When we finally did, it turned out that she was sleeping on her couch because her bedroom was so messy. That is a prime example of someone I don't want to be around.