I had cabin 7395 on the Costa Fascinosa (Venice to Venice - November, 2014 ) which was nice size, comfortable and had a balcony with two chairs and a small table. There were three closets -- two clothes closets and one with shelves and a safe. The room had twin beds, made up as one king size bed, and there was a sofa that could be made up into another bed for three people in the room. I was by myself so there was plenty of room. Three people in this cabin would be tight.
Be aware that this company can be considered the “Ryanair” of the cruise world. When you pay a discounted amount for a cruise, the ship will make money from you in many MANY other ways.
First some pluses:
Since the ship is just two years old, the cabin was in very good shape -- no stains in carpets, burn holes,etc. I am glad for the balcony as it was my "sanctuary" when the crowds in the public rooms became unbearable. Our ship was at capacity (3800 people).