Stayed at the Marriott last night. Ended up eating at Dishoom before heading to LHR so can't comment in Madhu's (but Dishoom of course is amazing).

Got upgraded to an executive floor room (somehow had booked a double by accident). Room was nice, view was of the interior aka other rooms. Got there too late to see lounge offerings but was impressed to see they serve wine/beer until 11pm and not just for a short happy hour.

Easy Uber to T3.

Would stay again though a tossup with the Ren -- maybe slight edge to Ren if you get the runway views.

Though as a DL person will likely look to book the HGI T2 going forward if in policy and only book one of the Marriotts if it isn't since the short walk over to T3 is very convenient.