Some qualities that you should look for in a academic transcription services are a good command of English, proofreading skills, and time management. Also, they should be patient and detail-oriented. They should also be tech-savvy. In addition to these qualities, they should be familiar with the format of various documents.
Another important factor to look for in a transcriber is cost. Many transcribers charge on an hourly or per-task basis. Their fee will depend on the turnaround time and the quality of the output. Make sure to look for those who are well-rated and have a good reputation with other clients. However, it is important to keep in mind that a lower price does not mean sub-standard work. It is best to look for a transcriber who is competent, and whose services fit your budget.