We are arriving at 6:35 pm. We would like to take the Maglev train.

You can take the Maglev train at airport station and get off at Longyang Road Station, which generally takes 8 minutes and cost CNY50 per person in a single trip. Then get on the Metro Line 2 and off at Nanjing Road East Station. After getting out of the metro, you need to walk about 600 meters and then you will find your hotel. The whole ride will takes around 1 hour.

Is it a safe route to walk at night with our luggage?

If you arrive at midnight with luggage, and worry about your safety, you are advised to take a taxi.