The underground is close by. You have the DLR at Devon’s Road and its only a 2 min walk. The fridge in the room is definitely a plus. Saintsbury is near the bromley by bow station, so you can get food, veggies, drinks.
The neighborhood is safe. If you’re looking to sleep early, just know that there’s a pub downstairs. The music stops around 10pm and appart from that it’s quiet the rest of the night. if you’re going to a seminar to ExCel London, I recommend staying at Jonas’ place!