Hi
Flight with Aer Lingus in May to Alicante from Dublin was very good. Murcia airport is a lot smaller and closer to Dream Hill2 but we haven't used it as yet. Best to avoid the 332 road if it is rush hour as it can be very slow. Stick to the motorway.
Whilst there at the start of May, we applied for our NIE ( which was very straight forward! ) and checked the progress of the house. As Conrad says, the hotel toejoven at the roundabout is a good "cheap" choice if it only for a few days to sort things out. The rooms a clean, nice decor but the only advice would be to eat out as the grub isn't great.