We stayed at Vergilius as we were attending a wedding nearby, and this was suggested as a suitable hotel.
The appearance is indeed very different to the website: on arrival, we were unsure we had the right place, and one comparison of the exterior was to a power station. However, inside it is quite stylish/contemporary/minimalist, with bedroom corridors dimly lit by downlighters shining onto glass-mooted room numbers, for example.
The room was very modern and just about spacious enough: shower, etc. were all new, spotless, and very good. Our room looked out onto the outside pool through an openable window. All staff were pleasant and helpful enough, and one was really friendly.
The spa was actually quite decent - again, clinically clean and with good facilities. Perhaps because we were wedding guests, and it was off-season, we could use it for free even after checking out. The gym is all modern Technogym (a decent "proper" brand), and around 10 machines, so can't fault there. The pool is only 15m and unheated outside/closed in winter. I sneaked in at the start of October, and it was bracing!
We paid €80 a night as a discounted rate, Inc breakfast and spa. They did apparently try to charge almost everyone for Internet access, although no-one used it: watch out for this. There is wired access only - no wifi, and poor mobile coverage.
Overall, we were lacking for nothing in the Vergilius. But we wouldn't stay there ourselves on holiday, because while it is excellent as a conference/business centre, it is totally and utterly soulless as a holiday stop.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC