Ask management if you can meet the person you will be staying with before you go, its only fair!

If you really disagree with it take it to the union.

It depends on the travel policy of the individual company but you'll find sharing rooms is quite common.

My old Company used to fly me Business Class on any flight > 5 hours. but even then I'd had to share rooms as there are some locations that have little to no appropriate accommodation

Example BrainShare SLC. Try getting 8000 people into a city not designed for so many and you have no choice but to bunk up.

What you should be entitled at a minimum is all expenses while away. Phone Calls, Meals, Snacks Laundry, etc. You might even want to look into ETT (Extra Travel Time) allowance if you work for a government dept.

On lieu of expenses. You might be paid a per-diem instead

On my last business trip to Sydney (which I don't work for this company anymore as we had to pay $200 of the total cost + food which was promised for a business rally)

I was bunked in a room with a guy I didn't know, he turned out to be O.K though.

The company said not to take anything out of the mini bar.. What gives.

So it turned out costing me a lot.