When putting together REST calls with ThingWorx, the API will assume that data should be returned in HTML format unless you specify a different format using the "Accept" header. For example, you can get the result back in JSON format by adding:
To your Postman request. This will return the results in a JSON object. Similar can be done for XML:
Your response above does list the properties on the entity, just in HTML format.
It is a bit strange that you're not receiving any values. Have you configured the properties as persistent and set a value?