I have stayed in Alex's place for a relatively long time and enjoyed it a lot.
The biggest plus was the location, with excellent coffee shops and restaurants all around, walking distance or short bus rides from many trendy East London attractions. The transport to all of central London is good.
The room is very private in terms of its separation from the rest of the house. The bed is good, the desk is small but helpful.
The is on the ground level and faces the street, so I did spent most of the time inside with closed shutters. The streets is reasonably quiet so there's no noise problem.
Alex was very helpful and responded very positively to my questions & requests.
However she wasn't around most of them; so I didn't have access to the kitchen, lounge and terrace inside her part of the house. If that matters to you, probably best to verify first if she's going to be there.