Dockside is a decent property with friendly employees. If you are looking for a place to stay that is within a stone's throw of the underground station, Shadwell is within a 2 minute walk. The neighborhood is decent and seems to be full of families and lots of working people. We were not concerned to be walking to and from the hotel in the mornings and evenings, but would wander late at night. It was noisy later in the evenings, we often heard cars racing up and down the street and sirens most nights.
The room was plain, the bed was not the most comfortable, but it was clean and a place to crash. The bathroom was utilitarian, hot water was plentiful and the show was powerful. There is evidence of mildew on the ceiling of the bathroom and likely old water damage, but other than that it's clean. When we asked that the linens be refreshed and the room cleaned, everything was left spic and span.
Breakfast was tasty and kept refreshed, with a selection of eggs, sausage, beans, cheeses, toast, pastries, meats, fresh fruit, yogurt, cereals, coffee, tea, and juice. Nothing fancy, but you can get filled up. Yes, it was the same each day, but it was fresh and filling.
Overall, Dockside Hotel is nothing fancy, you need to pay more for fancy and updated. It's a place to sleep and shower and is right near the Tube.