What to do with the windows of a vacant property while being advertised?

[John DeFoor]

I just finished the rehab of my 1st property and I currently have it up for sale or rent. My question of everyone is what do you do with the windows of an empty property while they are being advertised. The wife thinks we should leave the blinds open so people can see in and I feel that we need to keep them shut so everyone cant see in but I can see her point also. However with it being December I have a feeling it may set for a few till after the holidays. Just thought I would get some opinions from people who have done this before.