Assuming you bought Bitcoin because you heard/think it will increase in value, why would you want to spend them to buy something with such a valuable currency? I am also assuming this is not your only savings or have drained your savings account and are counting on Bitcoin to increase before your rent is due. Just one person's view. D
For me the uses of Bitcoin is like with fiat. It can purchase of physical goods and services, it can also purchase digital goods and services and of course remittances which has Low charges and transaction are faster.