All the rooms at the Corinthia from entry level through junior suite are essentially the same only differentiated by having been categorized by size which doesn't vary that much.
The first level where you actually get a different, nicer room layout is deluxe junior suite. Unfortunately, all of these face an undistinguished inner courtyard and, as of the last time I tried one, mobile service from my operator (O2) was non-existent. That's unfortunate since it would have been easily fixable by the hotel by the addition of several inexpensive femto base stations (these retail in the USA for under $250 each).
A suite facing outward may well be the first decent room.