See Fiat Qubo, the Citroën Nemo is constructed in the same way..

Bed size

Width: 137 cm (incl. 30 cm bed extension)

Length: 183 cm 

Optional equipment (see price list)

The picture shows an older version of the bed. You can see a newly designed bed on the Fiat Qubo page, which also would fit into the Nemo.