in your question
1--you say your partner. Are you married? If not then be advised that it is illegal for unmarried people to live together here. It is a serious offense.
2- walking. You will not want to walk anywhere here in Qatar. In a months time (or less) it will be hotter than hot here. Plus Doha is not at all walking friendly. People drive on the sidewalk-seriously-and it is just not safe to cross roads at all.

As for where to live. Find out through Google earth where the office is compared to these 2 housing choices. choose the closer one. End of discussion.