Firstly I just want to say that I'm asking this as a general question not necessarily in relation to my own situation but recently I received a notice of rent increase and am going to try and negotiate a fairer rate. After reading this thread (tl;dr landlord wants to leave rent the same but agency is pressuring to up it so they can increase their commissions) I'm thinking that I would be more successful if I were able to reach out to the landlord and negotiate the rent increase directly rather than through a middleman who has their own interests that oppose mine.
Lets assume for the exercise that you have a good tenant, pays rent on time and maintains the house to a high standard. How would you feel if your tenant reached out to you directly?
The actual reason for avoiding periodic leases is that their insurer will cover them until the end of the fixed term lease if the tenant leaves without paying (up to 26 weeks from some insurer)
If it's on a periodic, the insurer only covers until the end of the legally required notice period that the tenant needs to give on a periodic.