Free Rent for work

I have a rental property my mother left me it needs rehab, estimated cost would be between $15,000-$20,000 I also owe $11,000 in bills there. I recently met a friend of the family who does construction and he said he would be willing to fix the whole house in exchange for 1 year of free rent (he only plans on staying a year) if anything goes wrong in the future he said he will repair for free I have a contract set up I’m just trying to see would that be a good idea I would be charging $1,800 a month once he leaves should I do it why or why not?