Google translate and similar software isn't always that great. Hopefully in a multicultural city like New York you will know someone who speaks Spanish.
I would ask them to translate instructions simply and clearly to avoid any confusion and include photos to show they guest how it works.
You can also do this for key items in the house such as the cooker, heating etc.
Alternatively I am sure you can advertise for a student or Spanish speaker to do this for a small fee (business deductable expense)
You can then use the information for other Spanish speakers who visit.