DF and I have just got our housing miracle, so passing luck onto you. Tbh, I think that if you were to break the lease, unless you had an awesome landlord, you'd still have to pay the rent until it gets filled. Depending on the terms of your lease, you may need to pay the cost of advertising, the cost of your bond, etc. Its something I'd imagine you'd have to look into. Our lease was broken by the landlord so a bit different to you, we got our bond refunded in full etc.