Creating a database link from Oracle Cloud server to remote access database

I work for a small company that currently use Apex to run reports on our accounts system. Oracle is installed on our local server and part of the data is gained via a database link to an access database. We are changing our server and I was interested in trying out the Always Free cloud service to recreate the above. Can anyone give me any pointers on if/how you could connect the cloud service to an access database held on of local server? Please let me know what crucial information is missing from my question - I am sure there is some! Any advice would be gratefully received. Cheers Andrew