Places to stay in Seoul- hotel/PG

Hello all:) I am due to travel to Seoul May around the 9th May and I was wondering if there are any current expats living in Seoul who might recommend places to stay or if anyone offered PG services. Looking to stay for 5 days at the most.
Any resources or tips greatly welcome. I was considering Air BnB and or hotels.. but wanted to check paying guests facilities that might be a better option. Thank you :)