Yes the most likely place for a manhole with both cover and frame removed is the town centre area which was being completely resurfaced, and that would place it possibly on Rua H Baptista.
But Rua Martins fits witness RM's description much better IMO - because it is near the apartment and tapas, as the witness states
**Snip
I would further like to say that in connection with the disappearance of Madeleine, I saw a manhole with a cover removed.
This manhole is situated on a junction of a road that runs parallel to the supermarket near to the Tapas Bar and the McCanns apartment. The cover along with the surround that been removed and placed to the side of the road.
The road is lit by street lighting but I believe you would not have seen the hole and anyone could have fallen in.
I returned the next day and noticed that the cover had been replaced. I am concerned that she may have fallen down the manhole and was not seen.
http://themaddiecasefiles.com/post552.html#p552Mr Morgan's undated statement is quite specific that the men who raised his concerns visited their villa on the day Madeleine disappeared.
He does not specify exactly when he saw the uncovered manhole although he thought it pertinent to mention it in relation to the circumstances.
We watched Scotland Yard lifting manhole covers and checking drains ... is it possible this is a diligence which wasn't carried out at the time of Madeleine's disappearance ... particularly if witnesses like Mr Morgan had flagged up open manholes in the vicinity?
The interior of the manholes which Heri photographed portray only small apertures for drainage ... "I saw manholes in all Praia da Luz streets, and even in the small isolated hill to the West. I took photos of many of them, including the inside of two, where you can see that the connecting pipes are too small in diameter for a toddler body. And it is not impossible but not easy to open it without proper tools, as the ones used by the maintenance personnel.
Were all these manholes properly searched?"http://espacioexterior.blogspot.co.uk/2013/04/the-madeleine-mccann-abduction-janosch.html ... was the interior of the open manhole Mr Morgan worried about like this one? Apart from his statement there seems to be no other information about it.