When searching for the best monthly rentals in Honolulu, there are several factors you should consider. First, prioritize location. If your stay revolves around work, find a rental close to your workplace. If you're vacationing, choose a place near the beach or tourist attractions. 

Second, consider the amenities. Evaluate if the rental has essential features like Wi-Fi, a fully equipped kitchen, laundry, and parking facilities. If you're planning a long-term stay, these amenities can greatly enhance your living experience. 

Third, always check reviews. Past tenants' experiences can give you a clear picture of what to expect. Be wary of rentals with consistently poor reviews. 

Lastly, don't neglect your budget. While we all desire luxurious spaces, it's essential to find a balance between comfort and affordability. Research different options and compare prices before making a decision. 

Remember, the more time you spend researching, the more likely you are to find the perfect monthly rental in Honolulu.