The average tenant will treat it as semi-disposable, so do not expect to get it back in the same condition you left it. I've found the best way to keep the tenant from soing outright stupid things is to be sure you keep it in great shape. Everything should work and be proper and clean. As soon as they see you let something slip, they will double the bet.
That's my biggest concern. There's a chance I won't have to rent it assuming our savings are where I want them this time next year. We'll see how it plays out. Worst case, I think the benefits of taking the year outwiegh the thought of someone damaging the house (though I hate the thought of that).