Short term contracts can be made with serviced appartments such as the Oriental Palace, the Golden Lodge, Sedona Suites and others. It will be really difficult to find a private landlord willing to rent out a house or appartment for such a short term. Of course hotels are an alternative, but relatively expensive.
There is a nice, small scale, hotel (actually the term mini-apartment is more applicable, since they have big rooms and a small kitchenette) called Elegant, on Nam Ngu street. I think they charge about 45 usd per night now, maybe less if you rent it per month.
