Be careful to fully comply with all requirements.

In connection with accommodation the ECO must be satisfied as to the legal availability and adequacy of accommodation.
Means that where applicable the permission of the owner of the accommodation has been given and that the accommodation will be occupied for the exclusive use of the couple and without overcrowding.

Depending on personal circumstances the ECO may also need some reassurance that housing the couple in rented accommodation will not be in breach of any
tenancy agreement as regards sub-letting, as well as security of tenure of the accommodation.

Accommodation does not need to be elaborate as as long as you have at least a bedroom for your exclusive use.

The onus is on the applicant to provide confirmation that there is no objection to an additional resident moving into the accommodation.

A copy of the tenancy agreement together owners permission and a brief description of the accommodation is all that is needed.
There is no need for guarantor,joint tenancy or reference checking.