I used this company a couple of times in 2014-15. Airplanes are old, not well groomed, maintenance leaves much to be desired.
Money for canceled flights has to wait several months. I do not advise you to use this company

S7/Siberian Airlines is a heaven’s sent for being the largest domestic airline in Russia and it also has some international flights.
They do tick all the boxes for me and have the basics but the reason I am not giving them 5 stars is because of the delays I had and it wasn’t just once, on the other hand they have been very good at issuing vouchers however with my last flight that was cancelled due to recent events instead of refunding me the money on my account as promised along with another voucher no they issued me a voucher worth of something like £300 to use which is fine since I am planning to return to Russia but they have not consulted me to talk about it and some people probably would have preferred to get their money back on their accounts and use it for other things.

Bought tickets for S7 flight via travel2be.com. Shortly after S7 cancelled the flight. The agent (travel2be.com) could not be reached by any means, nobody answers the phone or replies to emails. The airline reply to this is "it is your problem". They cancel the flight, they sell the tickets via agencies that cannot even pick up the phone, and the passenger has to suffer. They do not even want to receive the documents via email; instead they insist on etickets to be printed and sent to Russia via snail mail. Really nice customer service, S7.

I bought a fully refundable ticket. Then COVID came in. As per the agreement with this airline with terms and conditions sitting in the ticket, S7 is obliged to return the money. They didn’t. They offer vouchers for fully refundable tickets but no money.

We've booked the tickets specifically because we were promised a refund in case the situation with coronavirus changes. A week later we had to cancel the flight. Then suddenly we find out that they've changed the refund rules and no longer return the money but instead give a certificate that is absolutely useless to us.
We tried calling customer services. The customer service representative was rude and the response was: "It is not our problem. The rules have changed a few days after you bought the ticket, so take it or leave it."
It is a lawless company that does not respect its customers. They can change the rules any time they want without a warning.