Oyster Worldwide, the provider, pretty much covered everything for me. They give you the option if you want help with booking flights and sorting out travel insurance. Though I didn't utilize this help (as I have traveled frequently before), it's very useful for inexperienced or younger travelers. The communication with the Oyster Worldwide team before my trip was excellent. There were phone calls from the Destination Manager and a pre-trip information pack and advice on the website. I felt truly prepared for my arrival in Romania.
Once I got there, the same applied! Most of the hard graft was done for me. Transport from the airport in Bucharest to the volunteer apartment in Brasov was all arranged (and if you'd rather stay in a hotel, they could arrange that for you too). Transport to two local castles were arranged for me (two castle trips, on the first and second weekends of my stay), transport to and from the sanctuary, and transport back to Bucharest on my departure.
Tours were arranged at the sanctuary each week. We could go around and help the guides, or just listen to the interesting facts and stories that they had about the bears. Once a week, we also had a feeding tour. I won't ruin that for any prospective bear volunteers – that's just too good to just talk about, you really have to see it for yourself!