Allan and his son David are very welcoming and friendly. The accommodations are as everyone else had stated: clean, well equipped for your needs, close to bus stop, easy and relaxing bus ride (25 mins) to and from city centre, super comfortable mattress.
Allan goes above and beyond to make your stay pleasant! He interacted equally great with myself, and my college-aged daughter. He offered to pick us up at the airport, will print things off for you, and we even had the pleasure eating a delicious dinner with him our first night there. (He also taught us cooking tips/lessons while preparing dinner in the kitchen.)
I HIGHLY recommend staying at Allan's place. If I'm ever back in Edinburgh, I'd definitely stay at his home again.