As the Albaicín in on a hill the best thing to do is start at the top and walk down.
The highest place that the Albayzin minibus bus goes to is the Salvador Church.
The other day I did a walk through the Albayzin with some visitors and recorded the route on my PDA.
I actually started off at the free car park opposite the Merendero Granja on the Carretera de Murcia
but you could just as well get the bus up from Plaza Nueva to the Salvador Church and then walk up to to the
Mirador de San Cristobal which is the starting point.
You can see the route with some photos on this page. http://www.everytrail.com/view_trip.php?trip_id=983225
The route is the following:
Mirador de San Cristobal
Iglesia San Bartolome
Mirador de San Nicolas
San Miguel Bajo
Plaza Bib Rambla
I got on the bus at this point to go back up the hill
but you could continue walking or stay on the bus to see.
El Rio Darro
Paseo de los Tristes
Peso de Harina
(you could do a detour here to Sacromonte)
Iglesia de San Salvador
Plaza de Fatima
Lunch at the Merendero la Granja.http://granadamap.com/granja/indexsp.htm