Thanks people. Will check a few of these when I go.
For the record, the company I currently use is CE Estates on Veres Palné u. As I mentioned in a p.m. exchange with Budapest [thanks again Budapest], they were terrific in the first year but gradually the service deteriorated. Currently they are not responding to faxes or emails (I have proof of receipt and checked the destinations), difficult to deal with by phone, not sending quarterly accounts, and not visiting the apartment on at least two occasions when I needed them to. As this is a simple statement of my experience with them, I don't suppose it can be defamatory to outline it, but maybe the moderators will amend my post if it is.
Ah well, here's hoping for better....