Visa Stamping from Canada/ Mexico

Wanted to add my experience to help others. It was helpful to know others experience.

Had an appointment at 7.45 am. Went at 755 am to consulate.
First security check where they kept my chewing gums packet and gave a coupon so I'm assuming you can leave your mobile here not sure though and then inside there is a queue for visa checkin.
First counter is for checking docs (ds160 confirmation, passport, i797 and canada visitor visa.), scanning the photograph (you will not need after this).
Marked my old expired visa with a sticky.
Second counter is for finger printing. checked the docs again (passport, i797 and canada visitor visa.)

Then moved on to the next line where others were waiting for the interview. Note that there is no waiting in seating area with tokens like in India you just go and stand in queue and proceed to the counter empty on your turn. There were only two visa interview counters .
Before me saw the officer asking lot of questions to a native canadian student for visitor visa and he took lot of time and then gave him a visa for one month because of lacking some document which was being explained in french to him.

VO - can i have your passport
gave i797 and passport.
VO - you are on H1B can i have i797
gave i797.
VO - so you work for this company X. what do you do (or some thing like that)
A- I work as Senior Data Engineer at X. Told couple of duties of what I do.
VO - what does X do
A- explained what Company does business in. did tell it is one of the biggest startups in usa (as it is not known to many)
VO - Do you have an employment letter.
A- Yes, sir I have employment letter and can share the offer letter too.
VO - yes please will have a quick look at it. (he browsed through the employment letter)
A- I joined this company recently
VO - I see you have joined it recently
A- It has been three months since I joined there already
VO - Your visa is expired
A- yes sir. I have a valid petition and I94 if you want to have a look at it.;
VO- What exactly do you work at the WM company.
 A- told the team name and what kind of data we ingest. (he seemed to have got it and interrupted in btw with by saying ok so you store this data)
VO - what is your highest level of education
A- masters in india
VO - was your masters course based or research based
A - it was course based with a project in the end
VO - what was the project about
A- it was design of switches
VO - what was it about
A - I'm from electronics so it is design of electronic switches (was planning to explain more but he was telling ok switches and felt he got it)
VO - was your masters in computer science
A - no sir it was in electronics, i have educational evaluation and original degree certificates if you want to have a look at it.
VO - yes give educational evaluation please, will have a quick look at it.
VO - your visa is approved you should get an email to pick in 2-3 days
(gave back my old passport and i797 and kept new passport and employment letter)

extras - hotel accomodation - byward blue inn is good booked via hotwire though expedia also offers great deal on this. hotel is good with good wifi, awesome breakfast and is walkable 5mins to consulate. offers bath robes and cloth slippers which i like. Also free printouts and free personal laptop if you need one.

you do not need visa fees print out atleast they never asked me though i got a gmail printout