What is the correct location and recommended arrival time for applying for an ED visa at the Thai consulate in Vientiane?

I was there just after 8, the gates opened just after 9, and I would think there were about 40 people outside then. They let in those with qeue number 1-20 first which I was in, then walked over to a desk marked step 1 (appointment confirmation) and step 2 (document screening). I had all required documents except a copy of my entrance stamp to Laos and Lao visa. My mistake. Was told to go to the second floor where a lady did the copies for me for 10 baht. When I came down people sat neatly in line for the 3 window counters accepting the application, and within a couple of minutes I handed in mine, the lady looked through it all and gave me a note telling me what time to pick it up tomorrow. No payment done today, I was surprised by this. The lady said “if you get visa, you pay tomorrow 2000 baht”. Fingers crossed!

Update: as Jude mentioned, the correct location is the “embassy of Thailand” on google maps. I just got here and we are currently 15 people waiting outside.