Staying at Elena's place was a wonderful experience - apartment is in great condition; surrounding neighbourhood (Monti) provides countless opportunities for coffee/food/drinks; placement allows you to reach almost any spot in Rome's centre by foot in reasonable time - for further distances Colosseo metro station is in 2 mintues walk, Termini railway station is about 15-20 minutes away depending on pace. Colosseum balcony view is a neat bonus. Clearly recommend!