OK so I finally managed to link my Google Calendar. Problem is that with the Hubspot app I can only see my appointments for today and not the rest of the week or month. This fundamentally makes this software absolutely useless. How can I schedule future meetings or calls if I can not view any further than today!
In the reports' library you should be able to find a report that shows all the scheduled meetings called "Meetings booked with me by activity date" - There are also multiple available reports that should help!