Fraser Suites Serviced Apartments in the river valley area is not close (easy walking distance) to an MRT station. You may need to use taxis or get a public bus or bus/MRT combination from there.

You could Google map and walk down to Tiong Bahru MRT station from there, but it’s maybe over 15 minutes in the heat and humidity.

Here’s the MRT network map of lines and stations -

https://www.lta.gov.sg/content/ltaweb/en/public-transport/mrt-and-lrt-trains/train-system-map.html

You can use this http://www.gothere.sg mapping and transport tool site to enter Fraser Suites and a Destination and it gives you routes and approximate prices. Click on the icons for bus, train or taxi.