- Detailed details regarding the room and house.
- Details on the people currently living within the house.
- Information on what they're looking for in a housemate.
- Photos are nice.
- Exquisite grammar and spelling.
- People who introduce themselves or sign off with a name. It's really annoying writing a message, but not having a name to address. "Hello Derp Derp..."
I think that covers most of it.