If you have experiences with electricians, you will know that they do not act in the same manner. Every electrician handles their task differently. Hence, it sometimes becomes difficult to assess whether the electrician you hired did a good job for you or not.
Here are some things that could indicate how good an electrician is. You will get the very first impression when they arrive at your door. They need to have an easy manner of talking, because they care after all going to tell you things you might not be acquainted with. They should not be hurried in their approach, because that could lead to careless mistakes. Most importantly, they should seem confident about their work.
You should keep a careful eye on how meticulously they try to get to the root of the problem. That is their first task anyway. If they are able to exactly pinpoint the fault, then they are good. Most electricians just make a stopgap arrangement that could go kaput as soon as they leave the door. Only those who could get to the very crux of the problem will be able to resolve it permanently.
See if they make you suggestions. They might tell you that your wires are getting overloaded, or that you need to have a higher fuse in your circuit, or that some of your appliances have worn out and need to be replaced. These suggestions are things you would not know by yourself, but your electrician could get into that.
Then you should also see if they are available if any further need arises. Electricien Trappes are available 24/7 so that they can be called if there is any issue at any time. Such a facility is much needed, because electrical problems can occur at any time without the least warning. You need to have the security that there is someone on call when you need them.