Answer:
The list is from Cheapest to most expensive:
Camping sites
Hostels
Bed & Breakfast establishments (a room in the same house as the owner). You may need to share a bathroom with other guests.
Guest house (purpose-built, usually private facilities)
Self-catering apartments, usually a fully furnished private apartment or house which the owners rent out)
Lodge (purpose-built and will usually have its own restaurant)
Hotel
Please note:
Grading for all of the above depends on the extent and number of facilities, NOT necessarily the QUALITY of the establishment. You can find really crummy 4-star hotels and really good 2 or 3-star guest houses.