Honestly for two weeks of work stuff having your own car beats chasing taxis every day, especially if you have to hop between offices or industrial parks on the outskirts. The metro is great for the centre but once you need to be somewhere specific at a fixed time it gets old fast. You need your passport, a valid licence, and a card for the deposit. To check what is available for a car when you need a rental in Moscow just browse the listings on
https://getrentacar.com/en-US/russia/moscow .