Stayed for two night in Surprise hostel, the staff are friendly and helpful. The hostel is located at the Vauxhall bridge road (main road) and just 10 minutes walking distance from Victoria train station and it is also walking distance to Westminster and Buckingham palace (you can take tube train to those places, but you may miss out the nice street view)
Clean and comfortable bed, but the flooring is dusty. Great breakfast ever (bread, oats, milk, coffee and tea) this is more than enough for me. Toilet and shower area is OK (acceptable), but the lighting quite dimmed.
Overall experience is absolutely good. Will back again to stay at this hostel.