Using the sun is probably one of the greatest assets (and challenges) when it comes to indoor or outdoor shooting..especially if you're a 1-person army or have a small crew.
In this example, I used a mobile app called "sun surveyor" to forecast what position the sun will be in. It's a great app, and best of all, it's FREE! If this was an actual studio or set, I'd probably set up and blast 8.21 gigawatts of light power through a window using expensive HMI pars (great scott's marty!)- but in this case, I used natural daylight and power of the sun - I just need it to be positioned correctly. Using the app, I knew at around 6:30pm the sun would shine right through the hotel window, and viola! Awesome light power!