@ serghio 

I am currently using Power BI with QBO.

1. Log into your QBO account first.

2. Launch Power BI Desktop & choose Get Data; in the search window type in Quickbooks

3. Select QBO Beta and connect.

This will download all tables and does not download GeneralLedger table.

For that you will need to create a blank query next:

Power BI Desktop ---> Transform Data--->New Source ---->Blank Query:

insert the following and it will take you to a list of tables and click on GeneralLedger :

= Source{[Key="generalledger"]}[Data]