You DON'T have to be a student to get these flights! StudentsUniverse.com.au is currently offering $50 off Air China flights + an additional $20 off with code "AUNEWUSER" on checkout. I purchased 2 tickets last night from Sydney to Warsaw, Poland RETURN for $720pp including taxes and my visa card fee whereas I was getting quoted $860 on other sites. They do offer no-fee payment options. The best way to find these fares is to find find the discounted fares on AirChina.com.au first and then search on StudentsUniverse for those dates. My eTickets were issued instantly and verified with AirChina. These discounts are NOT limited to Europe. I've travelled with AirChina to Europe previously and it's always been a hassle free journey and I would definitely recommend them as a full-service carrier.
They also appear to have random additional discounts as the flights I purchased last night were further discounted, so it's more waiting and checking at random times of the day and night.
https://imgur.com/a/HSgYIET
April 30 - May 27 - $793.00 with Coupon on Checkout
https://www.studentuniverse.com.au/flights/2/SYD/WAW/2020-04…
May 6th - 8th June - $793.00 with Coupon on Checkout
https://www.studentuniverse.com.au/flights/1/SYD/WAW/2020-05…
Stop-Over
Inbound: Beijing PEK - 20 Hours
Outbound: Beijing PEK - 20 Hours
Baggage
2x 23KG
What to see and do in Warsaw?
TripAdvisor - What to see and do
OddUrbanThings - 35 Places to Visit
How about some accomodation?
TRAVELO Hotels
Cheap connections from Warsaw to Europe
Warsaw to London - One-Way on RyanAir, $47 or British Airways $76
I did a lot of digging on Air China schedules a few weeks ago. Nearly all European cities have 20 hours stopover inbound. Frankfurt and Stockholm have 7 hour stopover on the inbound.
You can book tickets as open jaw, arrive in one and leave another.