Yes! On your experiment status page, you can click on a node in the topology diagram, then click on "Console" from the context menu. A new tab will will be created, hit return to get the login prompt. You can log in as yourself or as root (click on the "root password" link at the top of the tab). You can also activate a console on the "List View" tab on the status page.
Note that a new randomized root password is generated for each node, each time you start an experiment.