Bright, He's not spoiling your time...you are allowing him to do it. If you want to go to the vacation place, go. You don't have to be specific with your plans as to when you are going. Is your son around to be at home during that time or is he away? Has he ever done anything while you've been gone to make you anxious about him coming to the house? Is he on the mortgage?
You can always change the locks or add just add new deadbolts. If you have an alarm system, you can change the code. If you have an automatic garage door open, leave it on, but unplug it at the motor end. He can't get in then.
I wouldn't allow him to ruin my holiday plans. I know you are anxious w/this news, but he may very well not even stop in. As for cleaning the condo, now that's very unusual for him. Me, personally, I would want to go there and see how he left it before I had it cleaned...but that's me and my mind working in overdrive.
Any way, you have a couple of days to decide what you want to do, but I don't think I would be specific in the dates that you are planning to go.
