I definitely recommend Pavel's place.
The place is a bit far from the city centre, but well connected with bus+metro and takes around 25-30 minutes.
The room has a big bed and a wardrobe, perfect for short stay, but not bad even for longer ones (mine was 10 days).
The bathroom has everything you need, even the washing machine, and it is clean.
The kitchen is good, with a round table for four and some useful tools, like the coffee machine.
Pavel is nice and always available to answer your doubts.