1 Bitcoin is worth around 53,900 EUR on October 18.
It will be quite difficult to turn 1 BTC into euro with a single operation. 100% it will be monitored by government and 20% income tax must be paid. Or you will lose around 10% after using "shady cash out" service. (it is impossible to pay directly with crypto)
The best logical usage would be buying property. For 43-45k EUR it will be possible to get decent looking 1 room flat (about 40m2 in house like
Khrushchyovka) with ikea like furniture, electrical appliances and etc. It will be a corner flat (these one are always cold or it will be often damp at home) or on the first floor.

Or if you use a shady option, you might be lucky to get same type of flat, but with 2 rooms/higher floor/better furniture and electrical appliances.
You might be lucky to get a 1 room flat in a new house like this.

But it will be worse offer on the market. It will be a almost like a box on first floor with <30m2. No furniture, no electrical appliances, first floor.
P.S. 1 room flat it does not mean "1 room + bedroom" (which is typical for US). It will be just 1 room and a kitchen.