The Pestana is an admittedly upmarket hotel but a wierd location, albeit it is a 15 to 20 min stroll over the bridge to Sloane Square. And thus 15 to 20 min to the tube. Also not an area you would be hugely happy in at night alone, albeit this is by London standards which still makes it OK. Would not pay more than £100 a night for it, better to pay and be central or pay the same and trade down in a more central place.