You will be responsible for utilities on the whole home and for the most part, guests are really respectful of your home, especially if you ask them to be mindful of their usage ahead of time.
What has worked really well for our hosts is putting up signage in your guest space (next to the light switches, for example) reminding your guests to turn off the lights on their way out for the day, or to conserve water when they bathe or shower.
Each home is a little different in terms of what utilities you're responsible for, so be sure to check out the specific listing you're interested in! Common utilities paid for by the renter include water, sewer, electric, gas and garbage. Sometimes owners will pay for landscaping, others will require that you maintain the yard. It just depends on the house and the homeowner.