Furnishings typically represent a value of about 15% the value of the property. Furnishing a rental would typically be a feature for a specific prospective tenant's interest. You should look at who the potential tenant is that is renting in your properties area, what do they do for a living, what do they do for enjoyment, what do they like for sports, outdoor activities, commuting, dining, cultural enrichment, charities etc. Is the target tenant in your area interested in a pre-furnished apartment? You should consult with several local real estate agents/brokers and get their imput as to whether renting your property fully furnished would be attractive to prospective tenants. In some areas it might be, in others not so much. Terms & timeline of tenancy agreement will also affect the types of tenants you'll attract.
Hope that helps,