回复：已经签了lease, 7月1日开始，能反悔么？

Base on your information, the chance you get your money back is very slim. The only way you can sattle down this matter is try to reason with your land lord.
(see if he can reduce 50% of the rent for July. Since he can not get the room ready for you. However If I were you I may just find another place and forget all this.