What are the signs of a good clinic I should know about?

Hello everyone,
I am looking into physio clinics here for my mother with back and neck problems. She is suffering from severe pain since the last day. My friend suggested me of taking her to a physiotherapy clinic nearby. The greatest advantage of physiotherapy is that you will no longer have to rely on medications or painkillers to get rid of your pain. Here, the therapist will help you with various exercises, such as joint and soft tissue mobilization. These techniques and treatments, help overcome the pain and restore the muscle movement. These therapies also prevent the pain from making a comeback.
What are the signs of a good clinic I should know about? Few of her friends recommended this clinic offering physiotherapy treatments but I’d like any recommendations.

Thanks in advance!!