I booked a private room for 2 people 2 weeks before I came to Bangkok. From Suvarnabhumi airport, you could pick MRT to Phaya Thai and change to BTS Sukhumvit - Phra khanong. Hostel located about 1-2 mins walk to BTS Phra Khanong. But when you go to center of BK, it's pretty far and you need to pay attention to stop at right station. When we checked in hostel, the room we got a little different from the room we picked on apps "Budget private double room" turned out it was a bunk bed - a little disappointed. But anyways, the room is nice and clean. We got 2 bathrooms and 2 toilet rooms and a sink. There is 7/11 store and a few local and foreign food stall located behind apartment buildings near hostel location.