We stayed at Pio in August 2007 and thought it was great. The rooms are very clean and modern, and our room had a small ensuite.
The staff are wonderful, friendly and helpful (hello Olga!!) and spoke excellent english plus the breakfast that was included was excellent. They also have a laptop with internet access available and offered a very cheap laundry/ironing service.
As the earlier reviewer said, the entrance way to the building and stairway are both pretty grotty, but this is typical of St Petersburg apartments in general and gives no indication of what is inside the apartments so don't let that put you off. Note that it's on the top (fourth I think) and second from top floors and there isn't a lift if you have heavy bags to carry.
the location is also excellent - set in Mokhavaya street, it's about half a block back from the Fontanka river and a block from the Nevsky Prospect which is a very easy 5-10 minute walk. So it is very central and all the major city centre attractions are within walking distance.
We are going back in October and hope to stay there again and would recommend it to anyone going to St Petersburg who wants somewhere central and comfortable in a very central location
