I took the Novia to Akira last night. It is actually the restaurant on the floor above A222 (yea! Beat THAT!).
It is an intimate Sushi restaurant. The wind tends to whistle a bit (for those with vertigo this may put you off, a reminder of just how high you are) with excellent views to the puente Mujer and into the derelict Ministry of Communications (one can let the mind wander into some Junta-esque/1984 goings on in there). We were there at night, of course. The views were still great.
We walked in at 11.15pm sans reservation and shown to our very own corner, shrouded by blinds so our only view was of the bar, the vista and ourselves. Service was friendly but this can easily change in Arge; we didnt test it. The sushi was very yummy, but a little dry for there was just Soy sauce which can destroy the flavour after several peices but there was ample lashjings of reasonably priced Luigi Bosca to help it down.
Yes it is pricey (not so much with a 30% guia Oleo discount, Sign up, People!), the food isnt amazing, but we had a lovely time especially as it wasnt a planned meal out.
So, yes, try it out. As a restaurant with a view I recommend it,
Akira.