We had a great cruise on Marella Explorer 2. Our cabin was on deck 4 and was in a good position mid ships to get to the MDR, Market place for breakfast and the gangway on Deck 3. The only issue I had was the sound of cutlery or glasses being rattled around late at night from deck 5, MDR.
Cabin was spacious with plenty of wardrobe space and drawers. Only one socket though so we had to take turns charging phones, using the hairdryer, kettle etc.
Lovely shower with a glass door...makes a nice change to having a shower curtain wrapped around you!