Nats place is nice, clean and exactly as shown in the photos. It's fully equipped and everything needed is available for a family.
Nat was not available for our check-in but his friend was available to get us in. There were small issues which were promptly attended by Nats friend.
The apartment is on 5th floor of a good building. Although there are trains passing under the building, sound proof glass takes care of it pretty well.
Underground stations are about 10-15 mins walk from the apartment. London bridge can also be walked up to in about 15 mins
Overall we had a very nice time and we will certainly stay again when we visit London. I also suggest small families to stay at Nats !