We are from Singapore and are visiting Tuscany in mid October for 2 and using Siena to explore Tuscany by car - both Chianti area and Val D'orcia for 3 days.

1. instead of driving down from Rome, we are thinking of taking a train to Siena. Can you advise the train schedules (especially those with room for luggages and prefer a direct service as we don't speak Italian).
2. Are there car rental companies in Siena? recommendations?