As far as location for the ExCel center, this location cannot be beat. It literally looks directly into the plaza in front of the center, and made for a great location for us for a work trip. It is super close to the Elizabeth line and the DLR and the Emirates gondola, so you will be able to get to the O2 center quickly or anywhere else you might want to go. There are a few convivence stores and restaurants close by in case you need supplies or snacks. There were limited staples in the kitchen so anticipate providing your own coffee/tea, sugar etc. Things that would be good to know: there is an airport near and the building is under the flight path at the end of the runway. Planes don't fly overnight, but starting in the morning you will begin to hear them. There is a daycare below, and you will hear children during the day. If you're needing a quiet spot to work during business hours this may impact that. The unit is advertised as having AC, but there was none. We had some major issues with the bed, but the host was quick to replace the frame so we had a place to sleep the second night.