One caveat to the checklist approach: naming a person beside every task does not help if lender timing remains uncertain. The useful question is whether each dependency has actually been confirmed, not merely assigned. Before committing movers or contractors, I would separate fixed dates from...
Is the villa intended as a rental, your own home, or both? That changes how much weight to put on vacancy versus moving costs. I would also be interested in whether any inspection findings affected your offer or simply became items for the repair reserve.
Before discussing an amount, confirm which Spanish and Madrid rules apply to this particular contract, including whether an increase is permitted now, how it must be calculated, and the required form and timing of notice. Rules can depend on the agreement and timing, so a current local check...