It will not be advisable to make transactions in bitcoin within a country where cryptocurrency transactions are illegal by the law. But Imagine this scenario that someone has been using their bitcoins for transaction secretly successfully, and then one day decides to use the bitcoin that they have to make payment for something like a property to the owner of the property, If there is this kind of problem for instance where the owner of the property decides to claim that they did not receive any money in bitcoin, and the case is taken to a law court, what do you think the outcome of the case will be?
If proofs of payment are provided but in cryptocurrency, do you think the court will consider it even though transactions are tagged illegal with it? or will the case be thrown out and the owner of the property with the false claim of not receiving the money be allowed to go freely?
Do you mean rent or do you mean buying/selling of the house? I don't know how it's in your country but I'll tell you how it's in mine.
Two people go together to the Public Registry, fill an agreement, get approval from the notary and in this process they agree on two payment methods, pay via cash or via bank transfer, there are no other options. I think that procedure will be similar in your country. In this case, you choose cash but behind the scenes, you pay with Bitcoin but here is the problem, you two didn't agree on Bitcoin payments, which means that you ruined the agreement and for a bonus, you made a type of transaction that's illegal in your country. You lose everything in this case, I wouldn't risk this. Probably I would buy this way from a very close friend or a relative but with strangers, you have no idea how honest they'll be.