Here's a little video I did live from The Grand Hotel -- a hugely impressive property but man, I'm glad I didn't stay there...
The Grand's big drawback is its location -- it's a $100 TWD cab ride from the nearest MRT station, whereas the place I stayed at is right beside a stop further south and much closer to downtown Taipei.
The Grand's massive lobby. The secret tunnels lie beneath, I think...
Though reports on TripAdvisor tell of shoddy run-down rooms the place looked like it was in pretty good shape to me. It would be a good choice for travellers not planning to actually leave the hotel -- conference-goers, honeymooners, that kind of thing.
You could probably catch some pretty cool views of the city from the higher floors, but as a non-guest it didn't seem to me like I was allowed up there...