Here is an app with more than 25 filters, and one that actually lets you earn an income per ad!
Search by city & postcode
Pay per ad per room/property (no scope for avoiding payment for a 2nd or 3rd ad by amending an already published ad.
Switch account status (downgrade/upgrade account from tenant to agency/landlord and vice versa at the click of a button and have all account data auto transferred to new account.
Please read FAQ & key temp features as too detailed.
Thank you also to @Robert_Petitto for his contribution to filtering. I had to find ways to narrow search down to by city/town & then zip/postcode. The idea was to catch the postcode for the town/city in question instead of all the postcodes of all places. Got there in the end!