For sat-nav users, the best postcode to use is CF32 0LS rather than CF32 0LR. CF32 0LS is more likely to direct you along Merthyr Mawr Road and past the lawns. The problem with CF32 0LR is that it is likely to direct you to the house via New Inn Road and the Dipping Bridge.
Alternatively put Merthyr Mawr Tennis Club into Google maps.