Beautiful island, culture and people. They have free wifi in the capital which is a nice perk. We took a walking tour and did a under water excursion at Aquafari which were both great. Down side is that hotel food is pricey and cabs are super expensive. I'd recommend renting a car or taking the bus in to town if you are a hotel in Otrobanda.
WARNING: Parts of the Democratic Republic of the Congo are not safe for independent travel or sightseeing. Those visiting for business, research, or international aid purposes should consult with their organization and seek expert guidance before planning a trip. Kinshasa is has a high crime rate similar to Lagos or Abidjan. In the northeastern part of the country, there is the LRA near the border with the CAR/Sudan/Uganda and an ongoing conflict and refugee crisis in N/S Kivu (although Goma & Virunga NP are safe to visit) which make those regions not safe for travel.