I was living at Allan's for 6 weeks (may/june) and totally enjoyed my stay.
He's the best host you could imagine: very kind, funny and helpful, always there for a little chat in the kitchen (the place you probably will see him the most) but still lets you the feeling of being independent.
The house is just lovely: a typical old victorian building - packed with antiques and art - has a reeeally well-equipped kitchen and it's absolutely good-located: right next to the (southeasternrailway-)station 'Ladywell' and some bus-stops like 'wearside road' or 'lewisham fire sation'.
My room was bright, comfortable, with muchmuch space for my stuff and a waterboiler, so I could drink coffee in bed at the weekends...what a luxury! :P
I will definately recommend him to all my friends and come back, if I'll have the chance to trip over London again shortly - what I really hope!