Level? Do you mean rank? If that you mean than it's Rank 10.
The rank of a shop determines the services it provides. The maximum
rank a shop can reach is Rank 10, after which it will stop receiving
popularity points, although it can still be recommended to visitors,
contributing with popularity points to the avenue rank. Any service
provided by a shop can only be provided once per day, unless the
shop's rank goes up, in which case it will refresh.
Hope this answering your question.