What an adorable little flat! I spent 3 nights at Catherine's and loved my stay. Catherine has done very well for herself: the flat is very well located in the now trendy Hackney, close to many transport links; super clean and decked out with upscale amenities (the coffee grinder is to die for, just bought it on Amazon!), TV with access to Netflix for nights in; and she included lovely little complimentary soaps and shampoos that smell delightful.
Check-in is a breeze with the system she has in place and communication was without problems. The decor is lovely and the sofa and bed are both terribly comfortable.
Stay at Catherine's, you'll feel perfectly at home/but also in a bit of luxury, as well. I hope it is free next time I am in London.