Nice comfortable apartment just north-east of Salamanca - very efficient communication and check in. The place has everything one needs for a several days stay, there is a nice terrace which comes very handy when there is sun.
The place is 10-15 mins walk to the centre of Salamanca which was a pleasant walk.
Miguel is very helpful, proactive and accommodating - we were leaving late on Sunday and since there were no other guests checking in that day he kindly let us stay several hours loger which was much appreciated.
Overall we do recommend the place as a good base to explore Madrid.