The house is well connected to the center of London. Our advice is to take buses no 21 (for example from/to St Paul Cathedral) or 453 (from/to Trafalgar Square).
Check-in and check-out are easy.
At least 3 power adapters (Europe-UK) are available in the room.
We stayed all day out and used the kitchen for dinner. Aldi supermarket is close to the house (5 min walking) while if You need more choice our advise is to go to Asda (5 min taking buses no 21 or 53 or 453).
Also washing machine is available but drying is not so easy.
Maria is very nice and willing to help (better to call her by phone).