We stayed in Helena's place for two weeks and enjoyed the proximity to Shoreditch High Street and the Overground. Communication was good and Helena was on hand to help with anything we needed. The apartment is a good size and light during the daytime.
At the time of writing, the pictures in the listing aren't reflective of the apartment in its current state. The living room has an additional sideboard unit, futon, large bookshelf, chairs and about five big plants. The apartment is lived in rather than a place only for guests, which means the kitchen and living space contain what I assume is the owner's stuff (food, tupperware, books, etc).
While that's not necessarily a problem, if you were looking for a minimalist apartment without any extra stuff, that's not what this is.
The apartment is also opposite a primary school and the kids are quite loud at lunchtime. If you have important calls or recordings you'll need to avoid that time.