We got lost trying to find it coming off the Piccadilly line. Maybe would need better (and larger) signage like the Aerotel. It is located closer to Terminal 2 more than in between T2-T3. We took a wrong turn going up the stairs to the bus station rather than staying downstairs and then went to T3 because we followed Google maps (it will tell you to walk outside). Once we went down and found an info desk, the staff told us to follow Terminal 2 signs and this is how we found it.
Once we were there, staff were receptive, room was spacious, clean and comfortable, food on first level was very good. We were tired coming back from France straight to this hotel to catch an early morning flight and it was a nice respite.
Pros: easy access to airport (no need to walk outside), reception will give you clear directions how to go to your terminal with pictures.