  With the use of {\em ab initio} based molecular dynamics simulations we study
the structural, dynamical and electronic properties of glassy g-GeS$_2$ at room
temperature. From the radial distribution function we find nearest neighbor
distances almost identical to the experimental values and the static structure
factor is close to its experimental counterpart. From the Ge-S-Ge bond angle
distribution we obtain the correct distribution of corner and edge-sharing
GeS$_4$ tetrahedra. Concerning the dynamical characteristics we find in the
mean square displacement of the atoms discontinuous variations corresponding
either to the removal of coordination defects around a single particle or to
structural rearrangements involving a larger number of atoms. Finally we
calculate the vibrational density of states, which exhibits two well separated
bands as well as some features characteristic of the amorphous state, and the
electronic density of states showing an optical gap of 3.27 eV.
