Let me add something. I tend to be narrow minded. This is a repeat trip. Maybe you've done the standard tourist fare and you want to see a different side of the city?
The Crown Plaza is not far from the M3 in the Nyugati Underground. And that same underground has a corridor that leads to the 4/6 Tram. The 9 Bus might stop out front (I need to check that, but at worse it's a few minutes walk).
You will get to see the city from a new perspective and the connections to the familiar are not bad.
The architecture, culture, daily life at that end of things is consistent with Budapest as a whole.