It appears to me that none of the replies except the first one of Dr. J. C. Vashista, are to the point of what the "learning member" (LM) is asking.
LM wants to rent out his flat and wants to include a clause in the tenancy agreement for 2 months' notice on either side for termination of the agreement and the tenant vacating the flat.
I think that this is fair enough irrespective whether the renting out is for short term or long term.
Now suppose the tenant doesn't vacate even after two months. LM will have to go court for eviction. He may win the case or lose it. Neither will know the ultimate result. The Democles' sword of court decision will be hanging above both the parties.
If there is a 20% increase in rent the court will look at it only at the time of final decision. If the tenant wins the case the 20% clause will have no effect. If the tenant loses he will have to vacate or shall be forcibly evicted. At this juncture only the court has to take a decision whether 20% more has to be paid for the litigation period. So the 20% increase will be additional weight on the Democles' sword above the tenant.
At the time of signing the agreement it will be only a "yes" or "no" situation. If the tenant doesn't agree he doesn't get the flat. If no prospective tenant agrees for the clause, LM may have to remove the clause. The validity of the clause will be tested only if the parties have to go to court.