HI Camden, CP Albert or SBS Vauxhall are probably your best bets. The Albert will be very quiet locally at weekends though iirc.

Indigo Tower Bridge is a refurbished office block IIRC and it’s a decent enough hotel although the room sizes vary a fair bit based on the three times I’ve stayed.

Indigo Paddington which I quite like might be worth a look but again the room sizes vary wildly here.

On the last two occasions I’ve stayed in an IHG property in London I’ve stayed at HI Whitechapel which is a decent hotel but the area is a bit so-so.

Agree with what others have said re the Kensington Holiday Inns - avoid at all costs.

IHG in london is pretty poor nowadays and with the two Stratford properties bailing soon it’s only going to get worse.