We have just completed a 12-night cruise of the Mediterranean on the Celebrity Solstice. We enjoyed it enough to sign up for another Celebrity cruise on-board.
The Celebrity Solstice is not the absolute top of the line in cruise ships, but it does provide value for money.
We had a Concierge veranda stateroom. The stateroom was functional, the bathroom was a reasonable size, and the balcony provided room for the two of us to stretch out watch the waves go by. Our attendants were pleasant and helpful, although we didn't require much beyond the standard things. The only criticism I would have is that Celebrity has chosen an Apple network to drive the stateroom TV communications and I am not sure it is up to the task. The signal would tend to freeze up. Not a big deal for us -- we didn't watch it much anyway.
Functional cabin - average size
Nice size balcony
Convenient to front elevators, without being noisy.
You do have to travel to the aft for the restaurants.