We stayed in a nice AirBnB with an easy walk to the Cathedral and Plaza Nuevo. There are frequent small Orange buses (they begin with C and have 1 or 2 numbers) that will traverse through the Albaicin, others that will take you up to the Alhambra, and much cheaper than taxis.
We had to buy a Granada card to snag tickets to the Alhambra, the upside is that it came with a bunch of bus tickets, most of which we didn’t use.
Also stayed in a newer AirBnB within easy walk from Joaquin Sorolla trains station (as well as the Nord station—didn’t realize there was a free shuttle between the two stations),
The nice thing about AirBnBs you can select ones with washing machines. Ended up wearing only a third of what I packed.