In Donetsk, a lot of free office space the price level is above average. To organize Coworking in Donetsk I personally think not very reasonable, in Kiev there were attempts to open so many have closed in Donetsk, the risk of "not to fly" even higher.
Personally, I am in Kiev for a long time in this quality used offices "close" clients are now working at home, in the summer plan to look for something similar in Donetsk. Minus the winter season — pay for office + another 50 to 100% heating (cheap rooms).
Generally easier to 2-3x to rent an apartment as an office, or small office, more Coworking center will not be 100%.