This study aimed to: (1) to assess the Quality of Life (QoL) of pediatric patients who had undergone Hematopoietic Stem Cell Transplantation (HSCT) and their parents; (2) to explore how patients and parents perceived a nurse counseling intervention; and (3) to explore how health professionals consider the nurse counselor's role.This was a pilot descriptive study using quantitative and qualitative data.Parents' QoL was compromised in the domains of Social Functioning, Physical and Emotional roles. Patients' QoL was poor in all the domains except in Behavior and Family Cohesion. Patients and their parents considered the counseling as an effective help. Seven categories emerged from the analysis of qualitative data: support and taking charge, empathy, active communication and listening, evasion, sharing, awareness, and organizational availability. Regarding health professionals, five categories emerged from the analysis of the interviews and a focus group: support and taking charge, recovery in self-expression, support in relationship with patients and family, connecting role, and difficult integration within the team.The nurse counselor could empower patients and parents to improve their attitudes towards care pathway. The nurse counselor can be an important resource in the context of HSCT, even if greater integration within the team is required.