Hello Rim my name is ***** ***** I will help you with this.
For now please let me know what clause 7.1 actually says?
You want to know if you can just give notice at the end of the current fixed period?
No. Once you are out of the fixed period you automatically go to the periodic tenancy.
Therefore the contract is not correct. Yes your flat mate can negotiate to stay another month.
Can I clarify anything for you about this today please?