I use lemon zest when I cook
Alaska and Hawaii became states in 1959.
Yes, you need a comma, but you don't need then. And locate (relocate?) is not a good verb.
The sentence could be punctuated: "Once we rent the apartment, we can start considering a house and decide where we'd like to live."
You could also rewrite the sentence with the phrases at the end: "We can start considering a house and its location once we rent the apartment."
(after we rent is also better in this form)
His integrity was beyond reproach.
With high integrity and morals, the man became a well-respected priest.
Without personal integrity, you are nothing.
A subjective word is a word that can be viewed differently by different people. Being subjective may cause a statement to lack sincerity or cause confusion because it is not concrete. Such as unique, what one person might find unique another person might find completley ordinary.