Hello op,
Do you mean Harrow or the London Borough of Harrow? There are some lovely parts of the borough such as Pinner, Hatch End & Stanmore, which are far more expensive than South Harrow or Rayners Lane, for example. West Harrow, near the tube station, has some lovely properties, as does North Harrow, which is considered desirable, due to its proximity to Pinner, but the local shopping area is very down-at-heel. Harrow town centre is very run down & has few decent shops left. Harrow-on - the -Hill is lovely, but expensive. I’d avoid Harrow Wealdstone, as it’s very deprived, although it has fantastic transport links. Like everything, it depends on your budget & what you require from it.
Ruislip, Eastcote & Ickenham, in the London Borough of Hillingdon , zones 5/6, are worth considering & the council is far better.
If you want any further info., I’m happy to help.