Kass was a very nice person, atente to any situation that could help me.
Even, exceptionally, welcomed me on the most unusual time for check-in, which I have to thank him for his patience and saved me the night. :-)
The place is very close by Elephant Castle, where you can find many public transport, which I have not use, because London is a great city for riding a bike, and there's so many offers for renting them. I use Santander bikes (2 pounds/day if you ride slots of 30'), at 8' walking from Kass, and with them I was in a range of 20' from the city center.
Right next street there is the East Street Market, with anything that you might need for eating fresh food.
The bedroom is quite alright and affordable for one person, if you just need a place to sleep and spend mostly of the time visiting London, has I did.
There is no blackout curtains or something similar, so for me, which I am not much early morning person, seeing the day light at 05:30, was my biggest challenge there...