Serviced Flat in Central London?

[ShrubRose]

Wondering if any MNers know where we could find a good serviced flat in Central London. We've previously stayed in some of the Cheval properties, but we're thinking of looking for something we might like better.
TIA.

how long for?

and budget?

Periodic stays from 10 days to a month.

Last quote from Cheval was £398/night for a one-bedroom with a balcony in April. Less would be better, of course (!) but we want to be comfortable.

There won't be many people here able to spend 400 quid a night for a month OP. Good luck finding somewhere.