It varies with each airline and is often dependent on an agreement between the flight attendants' labor union (if they have one) and the airline. Where I used to fly, the purser got the same level of accommodation as the pilots. Most of the cabin crew got their own room.

Yes, in the vast majority of cases, flight attendants are provided with their own private hotel rooms during layovers. Historically, some airlines experimented with room-sharing to cut costs, but modern union contracts and airline policies now almost universally guarantee individual accommodations for safety, privacy, and better rest. These hotels are typically mid-to-high-range brands like Hilton or Marriott, and the airline covers the full cost of the room and transportation to and from the airport. If a hotel is overbooked or under a specific contract, pilots and cabin crew might stay at different locations, but the standard remains one room per crew member. In addition to the room, attendants receive a "per diem" allowance to cover their meals and incidental expenses while they are away from their home base.