First, we note that the transition to a paraelectric phase, characterised by zero polarisation, is observed to occur in the 600-900 K range when neglecting effects of vibrational entropy, whereas it is predicted to occur in the range of 400-600 K based on free energies. The results including vibrational contributions are in good agreement with experiment, where the transition is observed close to 400 K. Thus, the interplay between vibrational and configurational entropy is of great importance for the relative phase stability in hybrid organic-inorganic materials. The gradual transition observed here compared to the sharper transition in experiment is most likely a result of finite size effects of the simulation cell.