numberOfBedrooms

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > numberOfBedrooms

The total integer number of bedrooms in a some Accommodation, ApartmentComplex or FloorPlan.
Values expected to be one of these types
Number
QuantitativeValue
Used on these types
Accommodation
ApartmentComplex
FloorPlan

Source

https://github.com/schemaorg/schemaorg/issues/2373