GOOD: excellent location, quite newly renovated and clean bathrooms, possibility to air the room, reception available 24/7, warm water in shower, felt ok safe, towels changed and trash emptied every day, grocery stores / shops / tube and buses all very nearby
BAD: carpeted floors were dusty and walls were dirty, rooms are very small and on top of that inconveniently decorated space wise, no help with the luggage from the staff
Probably the best you can get with this budget in London these days.