We stayed at Alex & May's place for five nights and really enjoyed our stay.
Alex & May are very helpful in giving advice (just ask) and in our case have been flexible with check out time - thanks!!!
Re apartment: the place is basically new and has all the comfort you need and is roomy for two people.
Most important for us was the cleanliness, the excellent bed (we like a firm mattress) and the space (attention to details).
The location is good and walking in the area is not an problem (even at night). It takes 5 min to walk to Zocalo and public transport is nearby.
Regards
M&B