How to get to Notting Hill

The way I would do it is to walk up the Kingsway (passing the entrance to the old Tram tunnel) then the Central Line 6 stops west from Holborn to Notting Hill Gate.
You could also take buses 1, 68 or 91 one stop to Holborn.

Working under the assumption the part of Notting Hill you want to go to is by Notting Hill Gate (rather than e.g. Ladbroke Grove), I would either get the Circle/District line via High Street Kensington from Embankment to Notting Hill Gate (ensure you check the destination on the train) or with slightly less walking to the station you could get the Bakerloo line from Charing Cross to Oxford Circus and change to Central line to Notting Hill Gate- tho the extra walking during the change kind of makes up for the shorter walk to the initial station. I hope that is helpful!

The city mapper app is a good friend for navigating London Transportation.

Seconding the use of the city mapper london app. I was so worried about using the tube before my trip last year. With city mapper, you just put in where you want to go (it knows automatically where you are) and it gives you multiple options—walking, tube, bus, driving. It also tells you which tube entrance and exit to use. So easy. And the tube stations are all very well signed. The app also shows the time it takes, is there construction on the route, closures, etc. Everything you need to know.

I return to London in 2 weeks and transportation is not even a worry this trip. I like to use the website for pretrip planning to give me an idea of how long it takes to get from A to B.

https://citymapper.com/london?lang=en

I suggest becoming familiar with the app before you leave. This assumes you will have data for your phone while traveling.

Navigating by neighborhood name may not always produce the best possible results. An actual address or hotel/sight name is better.

I'm going to third the Citymapper app. It works in many cities around the world. You can request a step free route, bus only and more. It will even tell you which entrance and exit to use for the tube station and alert you that your stop is coming up.

This is an honest question I have for those who like Citymapper, having not used it myself- what features do you like about it that Google maps doesn't have? Just wondering if it is worth downloading another app. Thanks!

Download and use the www.tfl.com website.

This is an honest question I have for those who like Citymapper,
having not used it myself- what features do you like about it that
Google maps doesn't have? Just wondering if it is worth downloading
another app.

I like that it gives very specific turn by turn directions, including which tube entrance and exit to use (very helpful in those big tube stations with many options). It suggests the most efficient routes (that might be bus or walking instead) based on real time data. You can also filter for low barrier/accessible options such as step free and less walking and in the summer it suggests routes based on availability of air conditioned options. And it tells you where to stand on the tube platform to find a less full car. Maybe Google maps does those things but I've not tried it. I think TFL might offer something similar for London, but CityMapper covers a large number of big cities and the interface is the same, so I don't have to learn something new :)

I have found the citymapper app more useful than google maps, too.
You can always delete an app if it doesn't prove useful or if you no longer need it. After a trip I often delete trip specific apps.

You have to climb up the hill :)

https://maps.app.goo.gl/BSyFoYW5uDY3FWsZ6

https://maps.app.goo.gl/qUwbGyRc6PaanuHLA

https://maps.app.goo.gl/kU9cm1X7m6b7NJtPA

Citymapper is ideal for city-specific public transit. Personally I prefer Google Maps app as it's intuitive to use and has more features.

I like the Citymapper app too. I like that it gives real-time information on traffic and, for example, how long before the next tube train arrives at your station. In NYC, we liked that it told us which corner subway entrance was the best to go down.