No. No it is NOT okay for you to completely remove my ability to do any work on the project for an entire week with only three days' notice.
I'm sorry to be an inconvenience, but if you knew there was going to be a major service interruption, perhaps you should have thought to mention it to me in advance so that we could negotiate the timing. Because this week would have been just ducky. But the next three to four weeks? Those are Right Out.
Thanks for asking, though!