The Celebrity Constellation is a favourite of many and we were comfortable on the ship having sailed the Celebrity Millenium five years ago. Generally speaking the ship was in good repair although there were places that a coat of varnish and some paint are needed (especially in the Thalassotherapy pool area).
Service on board was excellent. The entertainment far exceeded our expectations. The cruise director obviously has a passion for his job and it shows.
We were in cabin 3031 (Ocean View) and were very comfortable. Plenty of closet space. Bathroom was roomy. Bed was very comfortable.
There are 2 north american style and two European style electrical plugs so you may wish to consider bringing one or two adaptors with you.
See general review for comment on dress code for ladies. What is acceptable in one mosque may not be acceptable in Abu Dhabi.
We walked to the Mutrah souq on our own (easy walk...once you exit the port go left and continue walking until you seen the entrance to the souq) on the first day. On the second day we booked a rental car and took a taxi to pick it up at the Al Bustan Palace Hotel (about a 15 minute drive away -- we paid 5 OR for this taxi ride although the first drivers wanted 7 OR...given that if you are hiring the car by the hour it is 10 OR per hour for the first 3 hours we felt that 5 OR for 15 minutes was fair. If you plan to rent a car you may want to ensure that you pre-arrange a GPS (sat nav). We were lucky to get one.