Can I meet the freelancer?
It is even recommended. Insofar as it is possible, it's important to speak with the freelancer of their skills, of the project, and to confirm their professionalism and motivation.
You can thus meet them in person, via Skype, or have a phone interview.
However, to remain secure, do maintain your written conversations on the platform. This will allow you to keep an archive of all messages, to be brought out in case of a dispute.
Also, when you receive an email notification, you can respond to the message by responding to the email. Your message will then appear on the conversation in your Malt inbox. It's even simpler than logging in to the platform, and your exchanges remain secured and archived.