Last Sunday I went to Pisaq, as promised. And, as I expected, it was 1000 times better without the guide.
To get there you need to take a colectivo at Puputi street, they go out very often and cost 5S on Sundays and 4S any other day.
Sundays are that special, because of the local market: you find incredible atmosphere there, many handicraft, wooden clothes, anything, in fact, and, apart from that, you can still see the old barter (exchanging one product for another without using money) system there, as it is said.
The place is very touristic, but still very charming. You find many restaurants and cafes there (the best hot chocolate in Peru was found in one German restaurant there - in general in this country they don't know how to prepare it), but it's funnier to try the local street food in the market.
After enjoying it go up to the ruins. Better go to the main entrance (difficult to do it walking, so you can share a taxi) and then go out though the exit via the market. We spent about 3h only in the ruins and could have stayed even longer - you have plenty of places to see.
The entrance is included into the general touristic ticket (130S or 70S for students valid 10 days and including plenty of ruins) or can cost 70S if you buy a reduced ticket (only the Sacred Valley ones, for 2 days. Is worth to go to Ollantaytambo the next day in this case).
P.S. thanks to @philshem
for some of these photos :)