SoiDB lists various types of accommodation in this category.

From five stars hotels to the most minor hotels, SoiDB tries to present all accommodation in the city.

Bangkok: We cover lodging establishments which offer dormitory beds, private rooms with shared bathroom, or rooms without air-con (fan only rooms).
Other City : Establishment which contains "guest house" , or "house" in its name.

Here you can find apartments whose monthly room rate include maid service such as room cleaning and change of linen.

This page lists apartments for long-term stay.