I came across this one by chance - fantastic views over London (particularly looking north and east) from the top (16th) floor of the Novotel St Pancras on Euston Road. I could make out Hampstead Heath, Highgate cemetery, the Holly Lodge estate and Alexandra Palace, and could see the ring of green beyond suburbia.
There's not a single shot of the view on the Novotel site, and while there's a small viewing space on the 16th floor, it's not developed as a feature. And I didn't have a camera with me - so you'll have to take my word. But it's absolutely worth a dekko.