My gut reaction is to tell the truth. I would explain the entire situation from being newly widowed to needing a place to sort out the truly necessary possessions. I would also be upfront about the time frame. Some landlords don’t mind short term renters, and some will absolutely rule you out immediately. Before I did any of that, I would put this question to your realtor. They will be the best to advise you. They may also know a rental that will fit your needs.