First the good points. The apartment was relatively cheap compared to anything else in the area. And it's a fairly easy 15 min walk to Kings X / St Pancras stations. It was also surprisingly quiet given the number of nearby flats. And the self-checkin was very easy with clear instructions from the host.
But the apartment itself is very very basic. It felt like a flat in a council estate. It reeked of cigarette smoke which was particularly bad near the bathroom, so possibly coming up through the floor from the flat underneath. The mattress was the smallest and most uncomfortable we've ever slept on. And the combined shower/bath drained so poorly that the water pooled up above our ankles when we showered.