@Shauna161
It definitely feels sketchy to me as well. May I suggest you start by coping the texts and pasting to the message thread for your reservation? That would bring the conversation to the platform, where you could respond on the record.
It is not appropriate nor safe to go off platform. In addition, I surely would not agree to switch houses, particularly not to one that is not listed on the platform. This is not at all appropriate, and to add to the situation, you have no idea what you'd be getting, or getting into. Not my cuppa tea, and a very potential bait and switch.
I'd find it easy to report the host, run like crazy and not look back!
Best wishes and let us know what you decide and what happens