Agree with the above, any sign of children in the house is a turn off. Similarly any evidence of a partner etc should be kept away. Ideally work premisis should not be your home, but I know this is not always practical.
And similarly as mentioned above, drugs or any drug related paraphernalia. I was recently at a punt, which about 15 mins after I departed turned into a drug deal, she was my regular, I won't be back.
Lastly, try to keep the rooms I will be in looking/smelling tidy. Especially the bathroom. I once arrived at a punt bursting for a pee after being dicked around and kept waiting for half an hour and had a bottle of Lucozade. By the time I got there I asked to use the loo to be told it wasn't working and that I could either go to her mates upstairs or to the supermarket at the end of the road. I went for option 2 and didn't go back, used my plan B, who actually turned out to be the girl mentioned above who turned into a regular until her drug habbit/dealing reared it's head.