I think you need to stop looking anywhere until you have come together and decided and written down the following:
Budget this should be about the same person slightly higher for the DH person
Kitty Contribution - Per month to pay for the general items that everyone shares use of (Loo roll/Bin Liners/Cleaning Stuff)
Cleaning Expectations - Are any of the group significantly messier or tidier than the rest - a common flash point... as well as thinking about a rota for who cleans what when
Food - Is it going to be joint or is it going to be everyone buys for themselves
Respecting Private Space - Obvious but it should be mentioned that the bedrooms are completely private unless invited
Phone Bill - Are you going to share a landline or all have mobile phones?
Bills in general - Gas/Electric/Broadband - whose name will it be in and who is going to pay what percentage - what if Flatmate A has showers twice a day and Flatmate B only has a quick shower every 3 days same with electric requirements that C has the computer on all day everyday and A only uses the iron every 3 weeks.
Guests - This needs to be decided on as well as notice for guests and randoms overnight no one is going to want an unpaying house guest hanging around using the electric and water etc, the DH needs to either be included or the housemate with the DH needs to go to them.
Noise considerations and any requirements for sleeping and getting up. As well as any medical considerations anyone might have such as allergies.
Never assume anything about any of them and Good Luck!