Well since she's started in the role...
the return of the Fabric licence has to go down as a success for her already, was instrumental in getting it sorted quickly .
the confirming of venue/education grants something that's been dithered about for 6 years previous (including for my faves CafeOto, Vortex and Bush Hall),
the re-establishing of the Community Radio grant/licensing single application.
Renegotiated the PRS fees for 'non-performance' venues ( already a massive success, you'll see more gigs in interesting places all over London as a result).
Set up an effective 'nuisance charter' for use by the Met Police  when they receive a 'noise' or 'rowdy clientele' complaint against a bar or venue.

Seems to have been very effective so far.

Couldn't give a fuck, always pays her bills on time and even pays cancellation fees.
As apparently tax arrangements don't matter in this 'post fact' world,
if you can elect a president without seeing his tax returns what does it matter for a minor employee of a city mayors staff.

She don't do trains, thats Transport for London.
Hypocrisy ain't the preserve of the left, there's hohos everywhere.

Like I say a great choice for the job and pretty successful so far,
but how would you know,
do you live and work in London ? 
are you involved in a business directly effected by her decisions   ?

After the fucking disaster of BoJos administration and their double standards (when Ministry of Sound, the owners major Tory donors, survives a challenge to their Licence at the intervention of the Mayors office  but Fabric gets fucked over) it'll be a breath of fresh air.