Can the nRF24L01+ CE and CSN pins be attached to Arduino pins A0 and A1?
Yes, you can. The mirf library is using the regular arduino functions pinMode and digitalWrite to manipulate the pins. So A0 and A1 should work as expected.

Please note that when you use SPI (which the NRF does), you have to use pin 10 (SS) as an OUTPUT (as to not put the AVR into SPI slave mode).