I have had the best time at Lera's place - it was, indeed, peaceful and calm. The bed I was sleeping in was big and comfortable, and I was sleeping better than in months.
Lera is welcoming, kind, compasionate and has excellent communication skills, therefore, I felt instantly at ease. She was also generous and lended me some essential things I forgot to take with me to London !
The location is central, I was using buses everywhere and the tube Elephant and Castle is around 15 minutes away. I also walked to a lot of places (when there was no pouring rain :)
I highly recommend for a tranquil stay in London!