Full year rent upfront

[Bradley Sainsbury]

My new tenants want to pay a full year of rent upfront. Their reasoning is, they are selling their house to move cities for a new job so will be getting cash from that sale and they want to pay upfront so they can work on rebuilding their credit and savings to purchase a new home in the next two years or so. 

Was wondering if anyone has experienced this before and what are the considerations for such a situation?