Good news! Bruce behaved impecably! Nothing damaged, only his toys all through the house, which is great, because it means he played during the day (he normally wouldn't before, or only in our bed).
Off course this was the first day. He will build up his confidence now, and probably get in some mischief on the future, but I'm happy we can leave him with the whole appartment to himself.
He also seemed less needy when I got home from work.