I'm planning a trip to Granada in April. The simplest (and cheapest) way in and out is flying into Madrid and taking a bus to Granada. My question is about my last day. I see that there is a bus that leaves at 2am from Granada and that the station has lockers. Are these lockers available at all hours? I'll need one after checking out earlier in the day. And is it relatively safe to hang out at the station late at night?