In general, the crew rest area for flight crew tends to be nicer and quieter than the one for cabin crew. This is probably because it has greater regulatory requirements.
These are the requirements for Canadian carriers:
https://www.tc.gc.ca/eng/civilaviation/ ... 0-2153.htm"flight relief facility - seat" - means a comfortable, fully reclining seat, separated and screened from the passengers and flight deck, equipped with a call device, sleep restraint, portable oxygen, and not subject to distraction from noise generated in the cabin. (poste de repos - siège)
"flight relief facility - bunk" - means a bunk that meets the Society of Automotive Engineers (SAE) Aerospace Recommended Practice (ARP) 4101/3, Crew Rest Facilities, used in conjunction with ARP 4101, Flight Deck Layout and Facilities. (poste de repos - couchette)
(3) Where a flight crew is augmented by the addition of at least one flight crew member, the division of duty and rest is balanced between the flight crew members and a flight relief facility is provided, flight duty time may be extended if:
(a) where a flight relief facility - seat is provided, the flight duty time may be extended to 17 consecutive hours, in which case the maximum flight deck duty time for any flight crew member shall be 12 hours;
(b) where a flight relief facility - bunk is provided, the flight duty time may be extended to 20 consecutive hours, in which case the maximum flight deck duty time for any flight crew member shall be 14 hours;
(c) the subsequent minimum rest period shall be at least equal to the length of the preceding flight duty time; and
(d) a maximum of 3 sectors may be completed.
Since, most modern wide-body aircraft are capable of doing flights greater than 17 consecutive hours, they are almost always fitted both a flight relief seat (sometimes two seats) and two bunks, usually located above the first/business class section (in the 787, A350, etc.) or in between flight deck and cabin, on the same level (in the A380 and 747).
Does anyone have the exact FAA or TC regulations and requirements for cabin crew relief bunks? I don't think I have ever seen relief seats for cabin crew, but I would be interested to know if any aircraft/airline offers them?