WoW~ I'm actually a bit envious that the host can get someone to come out and to do the work in 4 hours from the original phone call !! Where we live, it'd take a tradesman several days to respond with an appointment/date IF they even called back. 😞
Can you pack your things and put them in your vehicle for that time ? If you can't be there, it's a shame but obviously the host doesn't get a choice when scheduling a repair.