Magnetic hybrid organic-inorganic Perovskites have attracted much attention lately as they potentially show a magneto-electric coupling, thanks to the strong interaction between the framework and the molecular host. In particular, a diffraction study at zero-field of CH3NH3Co(COOH)3 shows a structural transition around 90 K concomitant with an antiferroelectric behaviour and a magnetic order below 15 K.We would like to study the molecular dynamics through the antiferroelectric and magnetic transitions by performing high-resolution quasi-elastic neutron scattering. In particular, the molecular cations should be responsible for the antiferroelectric transition and may be coupled to the magnetic order via a possible magneto-electric coupling.