Good location in terms of restaurants, metro stations and general amenities. While I didn't need him, Alex was constantly available in case of any problems. The room itself is comfortable, with a good bed, wardrobe and washing machine/dryer.
The main drawback is sound coming from the street as other reviews point out, I would 100% recommend getting something to mitigate the sound. The shower was also a bit finicky to handle, but that is more of a nitpick.
All in all, an excellent apartment to stay a couple days for that price and would recommend to any tourist visiting London.