You're looking for two things here: security and convenience. Sometimes it's difficult to get both, but it is important. First of all, a residential drug rehab center should be secure. You don't want your loved one simply to stroll away on a whim. Fact is, the temptation is there. So you want to know that the facility has a plan to keep them in the program. Second, you want a facility that is convenient to where you live. You will most likely be relied upon to provide in-person visits to your loved one. So you want a facility that is nearby your home to make it easy to visit when necessary and appropriate.
