@seamad:
There are no realtors here and finding a place to buy or rent is mostly either word of mouth or postings on telephone poles. As a rule I'd stay out of the city center, it's noisy and dangerously busy. Ninh Kiều is more business than residential with impassible sidewalks, lottery ticket sellers, and you take your life in your hands crossing a street.
We bought land in 2006 and had our house built, we live in the Nam Long development in Cái Răng, south CT, a few minutes walk from BigC. We own it. It's a pretty quiet neighborhood. Except for my cockatoos.
A friend of mine has launched a web site for people in your predicament, only a few houses so far but they're developing a network of contacts and can probably help you find something in your range.
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150 square meters, that's small, we have some nhà trợ for rent that would suit you fine, separate units.
edit: managed to misspell both Quân