Our stay here was great. The entire building has the feel of a hotel, with many apartments and studios inside. Getting our bags up was no problem, there was a lift and someone to help with our bags. There was also great wifi in the room. Whenever we asked for help with the safety box or TV they sent someone up.
The bed is comfortable and there is also a sitting area. Great room for what it is worth.
The kitchen has knives, utensils, a kettle, pots, pans, and a mini fridge. There are also a few heaters around the room so we never felt cold.
Our only issue was that it was very noisy sometimes. Neighbours next door played tv very loudly and we could hear it so clearly. Sometimes it was very hard to sleep. When we complained about this they said there was nothing they could do because the neighbours rent the flat privately. However, after talking to the neighbour in person she stopped playing the TV late.
Overall, great stay. The location is absolutely incredible, its just a 5 minute walk from sloane square. There is also a sainsbury's (a supermarket) and a starbucks across the street. Not even a minute walk.