I stayed for the second time in Eliseo, and can recommend it.
Highlights are GREAT staff, wonderful breakfast area in the 6th floor with view of the Borghese park, and finally its quiet place. You can easily find parking here too. Its also not too far from a subway stop, and most rental car officed are near by, so its practical for transit too. Its also possible to walk downtown from here.
But in the end, staff if great here; quick, helpful, nice, understanding and easy.