You can set your working hours for each day in your Google Calendar, so that colleagues will be able to see your standard availability. In addition, you can set your working location so that anyone that has access to see your calendar will be able to see where you are working each day e.g. at home or in the office.
To set your working hours and default location:
Click on the Settings cog near the top-right corner of the screen
Choose Settings
Click on Working hours and location on the left-hand side of the screen
From the top drop-down list, choose your main location from the choices set by the Google Administrators
Ensure the options to Enable working hours and Enable working location are checked
Select each of your working days by clicking on M, T, W, T, F, S and S as required
Choose your start and end time for the first day
Choose your location for the first day
If you work during the same hours and at the same location on each day, click on Copy to all, otherwise set each time and location as required
Click on the Back button in the top-left corner of the screen when complete