You ran a daily deal......Expect a bunch of lies from a bunch of people. They are going to want deep cleanings when it wasn't for a deep cleaning, move out cleanings if it wasn't for move out cleaning, they are going to want the basement done, inside of the fridge/oven and garage, expect people to want an entire cleaning who never cleaned a day in their life, expect people to not tip, expect them to live waaaay outside the coverage area and them tell you that you told them you would service them, expect them to pick and choose how many cleaners they want as if they have a choice, expect them to want a cleaning done the same day, expect them to want a low maintenance rate, HA even expect some to get a refund from the deal site and then try to still get their cleaning...ohh let me count the ways...LOL
If you don't go into this-deals- with a somewhat arrrgghh attitude they will walk all over you.
Make a disclaimer somewhere on your site and..... checklist, please take a checklist with you. Let your disclaimer be known what might constitute extra charges, excessive pet hair/dander, extreme dust, further travel, anything that is going to cost you more time and more money that's not in the norm. Towards the end of my deal I had no issue with looking someone in the face and telling them what was going to be extra and what wasn't included in the voucher.
If your voucher was for a certain number of hours make it clear on the number of hours how much it is after and how much you KNOW for a fact you can finish in those hours. If the voucher was just for square footage make it clear which rooms and areas you KNOW you can finish. Don't let it get to the tail end of the cleaning and then tell them, make it be known when you get there so they will not have unreasonable expectations as they probably already do.