Great location! About 12 minute walk from Paddington station and 5 minute walk to Lancaster gate.
Worked well as a family with 2 kids (3 year old and 1 year old). Dana provided a crib and baby chair.
There are 5 flights of stairs to the apartment. The lift can take you up 3 flights of stairs. I carried our luggage up 2 flights which was not an issue for me, but keep that in mind if you have heavy luggage.
We used a double stroller to get around London, most stations have elevators but some do not. I carried the stroller up and down stairs which again was not an issue for me. Pedestrians were extremely kind and offered help.