Modeling a house
I recommend viewing it in "first-person" mode (by clicking the person to the right of the footsteps) in full-screen. This allows you to 'walk around' using either the arrow keys or the WASD keys and using the left mouse button to rotate by clicking and dragging. You are able to move through walls to enter and exit the house and can hold shift to move faster. It may be slow depending on your internet connection.