From the Department of Housing.

Rules around short-term lettings – defined as the letting of a house or apartment, or part of a house or apartment, for any period not exceeding 14 days- are changing on July 1.

Under the new arrangements applicable in rent pressure zones:

Homesharing (the letting of a room or rooms in a person’s principal private residence) will continue to be permissible on an unrestricted basis and be exempted from the new planning requirements.

Homesharers will be allowed to sub-let their entire principle private residence (house or apartment) on a short term basis for a cumulative period of 90 days where they are temporarily absent from their home.

New Regulation of Short- Term Letting (Dept of Housing)

Thanks Bebe