We've stayed at BW Carib, Emerald Beach, and Green Iguana for first/last night on STT. My pick is The Green Iguana. A balcony room with killer view and either fridge/micro or full kitchen for about $165/night total in the off-season (not sure what the rates are in high season). Rooms were comfy with nice linens, freezing cold a/c, and even the rooms with just a micro & baby fridge had some dishes and essentials for eating in. The onsite managers are super nice and very helpful. They have beverages for purchase (cash) in the office, will send a cab to meet you at the airport, and when we were there last year they even let us do a load of laundry.