(We have seen many Airbnb's this year on our trip around the world. In fact, we've stayed at quite a few of them within London this year.)
The apartment itself was quite lovely. The beds were comfy and the living room cozy. Lovely decor.
Things outside of that though were of much concerned. There are quite a few things needing to be fixed within the apartment.
Also, check in and out were not smooth. The key was not in the lock box when we arrived, so had to wait to receive it, and we got a phone saying the key was not in the lock box after we left, even though that's where we put it.
The area itself in London was sketchy at best. (A few nightly screaming disputes between neighbors, dried vomit on the ground, shattered glass in the streets). We didn't have a problem walking to and from the tube during the daytime, but I'm not sure I'd stay again as a family.
It's a good place to rest your head at night if you're just going in and out to see London. But without fixing a few things like the front door lock so you don't feel trapped inside or check-in/out. The price point is lowered or things are corrected.