Add the Room schema

Yes. it is possible to add the Room and Bed and Breakfast schema using inside a local business schema.

Reference screengrab: https://prnt.sc/1qjqwnx

You can see it editing a post or a page or in which url?
I would like to add schema for a Bed and Breakfast.

Can you please refer to the following tutorial and let us know back if you need further assistence?

Reference tutorial: https://structured-data-for-wp.com/docs/article/how-to-set-up-schema-for-local-business/

Thanks but the Structured Data plugin costs 99usd yearly, should I buy and install it? No possibility for a free plugin?

Yes, You have the possibility to use it.

Please do Refer to the following tutorial: https://structured-data-for-wp.com/docs/article/set-up-schema-structured-data-for-wp-amp/

Thanks a lot and then the test tools made me to feel safe too!
https://developers.google.com/search/docs/advanced/structured-data

You are welcome. If you have any other queries or issues, Please create a new topic.