We recently traveled by SVR AC Volvo semi-sleeper buses from Hyd-Goa-Hyd. The moment we entered the bus, we realized we made a mistake by booking SVR travels, both way on our route (Hyd to Goa and back to Hyd) the bus was stinking badly.
The blankets were in horrible state as if they have never been washed, the bus itself looked in very un-hygienic condition. I had to literally cover my nose during the entire journey to somehow avoid the stink. It was not only me who had this problem but all passengers were complaining about the hygiene standards.
I am not booking with SVR ever in my life and of course I am going to advise my friends and family to stay away from SVR travels, better not book your trip than to book with SVR.