Punishment does not interest me. What I want to see from prisons is, for some offenders, deterrence and rehabilitation, and for others, protection for the public. Some murderers cannot be rehabilitated with a satisfactory low risk of reoffending and should be kept behind bars until they no longer pose any danger. Giving such offenders reasonably pleasant conditions probably makes the lives of prison guards easier so I would be for that.
Victims of crime and their relatives have valuable but highly subjective perspectives on crime. We should not rely on them to dictate reasonable policy any more than we would ask patients to draw up chemotherapy regimes.