Early in the film we have the low point of François forgetting Charlotte's birthday and then trying to make amends with a rapidly conjured cake and a rendition of happy birthday from the staff. Charlotte is not impressed.
Into this already strained relationship comes Alex, Charlotte's former husband who was thought to have died in a tsunami. This clearly brings with it a few problems. First, there is the fact that as Alex isn't dead, he remains Charlotte's husband, nullifying her marriage to François. Second, and arguably more of a problem, is that Alex still legally owns the hotel, even though it was rebuilt and its image completely transformed after Alex disappeared. Third, and perhaps the biggest problem of all, is that Charlotte appears to be gravitating towards Alex and away from François. However, François reluctantly agrees to give Alex a room, allowing him continuing access to Charlotte. Full board, you might say, which is the literal translation of the French title.