To dream of being in a apartment unit represents a perspective on a situations where you feel you don't have full independence or free will to act as you wish. A situation isn't as interesting as you'd like it to be. Having to respect secondary issues or obligations. Stability in a situation where you don't have full control. Minor emotional or financial turmoil. Minor obstacles to overcome while feeling generally secure.
Negatively, being in an apartment unit may reflect feelings of having no choice about putting up with problems or annoyances that you don't want to. Consider the saying "beggars can't be choosers." Feeling annoyed that you can't get time alone or do something privately.
Example: A woman dreamed of being in an apartment unit and feeling sad. In waking life her male friend whom she wanted to date was devastated by a breakup and this prevented her from making a move on the male friend until he got over breakup. The apartment reflected her perspective on the opportunity to date her male friend as being open, but with the ongoing obstacle of his heartbreak preventing her from getting any closer to him. She felt confident that the breakup was permanent, but felt that the emotional pain was a problem she felt forced to live with in the interim.
Example 2: A woman dreamed of living in an apartment with her ex-boyfriend. In waking life she was in the process of getting her life back together after getting a new job and was annoyed that she couldn't move in with her boyfriend yet to fully restart their relationship.