I wanted a flat to stay in, as I introduced my 13-year-old niece to one of my favorite cities. This fit the bill perfectly. Super-convenient to Kings Cross, St Pancras, the British Library (all about a 5-minute walk), and Euston (more like a 10-minute walk).
Magid was great at communicating with us (we never got to take him up on his offer to meet us & give us the lay of the land) via text and email. There were fresh flowers on the table when we arrived, and the beds were comfy.
We did hear some occsional loud talkers as they walked by, but nothing raucous. And we quickly got used to hearing the Tube rumbling beneath us. Neither was enough to have come up in our conversation.
It was great to be able to make a cuppa in the morning, and have a fridge in which to keep yogurt for breakfast.
My only word of caution is that if you're fairly tall (I'm thinking maybe from 5'11" upward), you'll feel a bit squeezy, height-wise. That's just a factor of basement flats in London, I'd guess. In the shower is where you're likely to notice it most.
Plenty of outlets (remember to bring an adapter if you're not from the UK), the TV was nice to have, and I got plenty of work done at the cute table. And note that the few stairs from the street to the door are pretty steep, so packing light would be an asset.
We enjoyed our stay, and slept really well on comfy mattresses (yes, even the sofabed).