Managing features for a real estate agency
Best to avoid entity-attribute-value structures if possible as they complicate the model and are unnecessarily fiddly to work with.  It sounds like the fields are going to be the same or substatnailly the same across all the houses, so you're probably just better adding them onto the property record.

The exception being if you really have a genuine 1:M relationship.  An example might be if you wanted to record (say) dimensions and room type (living room, bedroom, bathroom etc.) by room for a variable number of rooms.