I have use there service for couple of times and never had any bad issues with them. And specially those who want to visit Russia Oltatravel are must try as they are very professional and they are expert with the Russia.
Me and my two friends went to Russia and we took there service. It was our 2nd time in Russia but first time with them and ya we felt like why we didn't found them on our first visit they are awesome with there service and very professional.
Ya i am happy with there services. They were very friendly and i had no problem in my whole trip. And cost is also standard, must try those who want to visit Russia.
Main thing about them is they know what you will need and what is must for you. They will help you out in any matter regarding the tour. That was my first time in Russia and my experience was great.