I normally book my own things separately, but this summer I found a deal on Travelocity for a RT JFK-VIE, including five shared-bath single room hotel nights, for $1100. The same flight cost $1300 on its own and the hotel would have been $400. The hotel turned out to be shabby but very clean. I bid on an upgrade to first class on the way over for $400, and upgraded my hotel room to a tiny single with a private bath for $150 extra for the whole five nights. In the end, I paid $1650 for first class/coach return, plus five nights in a tiny private room with private bath. If I'd booked separately, it would have been $1700 for coach both ways, and a shared-bath room.
BTW, I wholeheartedly recommend bidding (or splurging) on first class on the way over whenever it's possible. Being able to sleep for about 4 hours makes the first day in Europe a totally different experience! Usually I tough it out with a coffee IV and crash at 7 pm. This time I had a slightly tired, but totally normal first day and got way more out of it. Coming back, coach isn't a problem--it's just a slightly long day and I somehow can always nap coming home, even in a coach seat.
So, long story short, while I'm very independent and generally distrust package deals of all types, I was proven wrong this time and got a much better deal. I'll keep this option open in future.