Usability, acceptance and security of use are key factors in the validation of Virtual Rehabilitation system. Current literature offers different questionnaires for this purpose, but many of them do not consider some important issues and other are inadequate for patients. In this paper, we present SEQ (Suitability Evaluation Questionnaire) a novel questionnaire designed specifically for Virtual Rehabilitation systems. SEQ is based on a questionnaire with proven efficacy (SFQ) but with new questions that cover fundamental items not covered by SFQ. SEQ is an easy to understand questionnaire, with an affordable number of questions (14), which is being currently validated. This contribution presents also the study that is being carried out, and the preliminary results obtained from patients who have already completed the study (N=13). These initial results show an acceptable internal consistency of SEQ. As a secondary result, this contribution also indicates initial suitability evaluation of a Virtual Rehabilitation system designed for balance recovery.