We stayed in Sara's place for a week and absolutely loved it. Sara was very attentive and friendly. The studio is not too big but totally comfortable for two people. It is within walking (10-minute) distance to at least three metro stations: Shoreditch High Street, Liverpool Street, and Aldgate East. The neighborhood is trendy and vibrant: restaurants, pubs, shops, weekend markets (we particularly enjoyed the Spitalfields Market).
The only thing you might want to know is that the building is close to a carwash and a busy road, not say there are many nightlife options nearby so it can be noisy sometimes at night (if you are not in the party mood). Sara did duly disclose this information in the description so I was very much aware before checking in. We had no problem with it--but just in case someone finds this information helpful.
Overall, it was a lovely vacation and Sara's hospitality certainly made our London experience even better.