Markus reacts quickly to inquiries and is flexible. If Markus is not in Budapest (I don't think he lives there) a Hungarian friend takes care of introducing you to the house. We've also met him and he's very helpful as well.
Markus inquired if everything was OK during our stay there, and solved a minor problem we encountered within an hour, by coming by and fixing it.
Markus was helpful and thoughtful. Very prompt and good communication with him.