Despite booking almost three months prior, we did not receive any contact from the host that the house had been doubled booked until mere hours prior to check in (and not until I'd followed up the second time I'd asked for check in instructions). The host implied that we did not have a booking also added needless stress while we were already travelling to the destination.
Although we did really appreciate the host finding alternative accommodation for us for the first night, the host was only able to house 4 out of 10 of us the second night, and no dog and we were left to fend for ourselves on New Year's Eve (one of the most difficult nights of the year to find accommodation). The apartment had also not been made up with dirty towels, sheets and rubbish.
All in all, a pretty disappointing experience that ruined our New Year's plans. Lesson learnt, stay with hosts managing their properties rather than third-party companies.