Maria's house is definitely cozy. It's close to a tube station (which is very important in London) and also a quiet and beautiful zone. You're at least 20 minutes away from everywhere. The flat has everything you need; we were provided with everything. The shower is a bit small, but it's ok since you can previously see that in the pictures at airbnb's platform (no sourprises at all). You'll just get what you see. Another issue is that you have many markets arround.
As regards Maria, although we couldn't meet her, she was a perfect host, extremely kind and warm. She provided us not only with food for a complete breakfast, but also with every guideline we needed.
I really recommend Maria's flat. We had a wonderful time there!