I had polite and friendly service from the staff. However, the car did let me down with an electrical fault whilst on a long journey- but acknowledge this could have been outside the control of the staff. I was offered a small refund/discount but was left completely unclear how this would be done in addition to receiving the deposit back.
Contacting Sixt is very difficult and frustrating especially trying to contact the branch- you cannot get through. When I chased about my deposit refund etc. I was left very confused.