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A transfer to Real Madrid will be an excellent one for Mbappe. This I mean is that Real Madrid can give Mbappe trophies and as well as money. Real Madrid is not a small club such that they will not be able to pay a good player like Mbappe handsomely.
If Mbappe really wants the Champions League title, the best place to go is Real Madrid because it is Real Madrid and Manchester City that has great chances of winning the Champions League. I would have included Bayern Munich but I am not so much confident of Tuchel's Bayern.
If PSG let Mbappe go then I'm sure Real Madrid will try their best to get him because a player like Mbappe is not easy to come by.
Mbappe is also unlikely to accept a much lower offer because big money is part of being a great footballer.
Yes, but it all comes back to Mbappe's decision whether he wants to play for a much lower fee.