This app is well located if you want to be close to Victoria park, the Olympic parks and stadium, not too far off from Canary Wharf or Hackney. There is a sub on a 10-min walk, but I suggest you combine the sub with the Santander Cycles to get quicker and easier back and forth. Especially as you can take the cycles 2-min from the app and you end up straight onto a cycling lane through one of parks that is connected to Victory or the banks of the Lea.
Christen herself is helpful and will respond quickly to any enquiry. The app is spacious enough and excellent for a young(er) couple of 2. The street is indeed quite noisy at night so make sure to bring your earplugs!