Wow, this could be a law school question.

If you had an agreement to rent the furniture then that agreement is effective, even if you didn't sign anything. The agreement you did sign is not effective because it did not reflect the meeting of the minds between you and the renter and the renter acknowledged that. So the signed agreement is voidable, and you did void it, so that's out.

But you still have the original oral agreement which should be effective as long as at least one of you wants it to be. So you can hold him to the original terms you agreed upon orally, and he can do the same to you. Of course, if there's a fight about it, you both have the practical problem of proving what the terms you agreed to actually were.

If you both want to cancel the agreement, you can do that. Save that e-mail where the renter admits the contract is not what was originally agreed to. You only have to pay a cancellation fee if that was part of the original oral agreement you two had.

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