Nowadays when everyone over the world knows the variety of the ways of communication can reach you via email, w.app, Twitter etc. Seems to be easy and simple.
Yet, it is not that simple. In Greece most of the shops, medical clinics, workers and professionals won't reply to your message although they have an email address.
It takes time to understand manners of people from other countries. Well, in Greece, if you send your message for a professional or would like to place an order or even make an appointment with a doctor, your chance to receive an answer is close to zero. The reason is Cultural Code. Greeks think that contact by email is impolite. Their communication is mostly by phone call.
Obviously, there are a few who reply to an email due to the fact that they have been living abroad and know other custom business.
As for Real Estate Agencies - my experience shows that 90% of them do not react to any email message.
By the way, pay attention while you search a property via one of the real estate website. there is a repetition of the photos and the dot on the map does not indicate the exact location of the property.