Did it stop straight away or after parking?
Lead with it if the car stopped while it was still running. Mention whether the instruments went dark and whether the car displayed a charging or electrical warning. If it drove normally until you switched it off, say how long it was parked and what happened at the next start attempt. Those are two different sequences.
Could it be a charging fault?
The cause could be the charging system, a weak battery, a connection or a different fault. Ask for a check if the problem returns. Another successful start is no assurance that the car can get through Stockholm traffic. Follow any red warning and the instructions in your handbook.
When should I ask for towing?
If you are safely parked, describe the sequence to our Stockholm jump-start service. If the car stops in traffic, prioritise getting to safety. See our breakdown guide and arrange vehicle recovery in Stockholm if it needs moving. Note the exact warning only if you can do so safely.